Primarina, as a Popplio, was very playful and liked to make bubbles for fun and clap her hands. At first, she was afraid of people but under Lana's care she became friendlier and learned to bond with humans. Primarina cares deeply for her trainer and has a close friendship with her, shown when she felt unsafe seeing a Dewpider had a crush on her. She also cares a lot for her best friend and teammate Sandy. Primarina is close with Lana's family, especially Harper and Sarah. In addition, she is good friends with Lana's companions and is also close to their Pokémon.
Upon evolving into a Brionne, she maintained her personality from her pre-evolved form, but when she made a huge bubble after evolving, her personality was similar to Ida's Brionne prior to her evolution.
Lana was using a Poké Ride Lapras and found saw several members of Team Skull intimidating Popplio. Lana had Lapras freeze the grunts with Ice Beam, then came to rescue Popplio. After taking her to the Pokémon Center, Lana fed Popplio which led the two to become friends and partners as they been inseparable ever since.
Lana was fishing with Popplio. Once they saw Ash being startled by a Bruxish, they both started laughing, with Ash laughing as well. Later, Lillie watched over Popplio while Lana rode a Tauros along with the other Trial Captains. Once Ash came to the Pokémon School one day, Popplio made a watery balloon to surprise him, as Lana and others made a surprise party for Ash. Lana also had Popplio race Pikachu. Though Pikachu was quicker than Popplio on land and swam as fast as he could, Popplio was much faster at swimming and won the race. Lana praised Popplio and told her that it was amazing. Lillie later explained to Ash that Popplio could swim up to 40 kilometers per hour. Popplio was with her trainer, who went with Ash to see what new Pokémon he would catch in the forest. Popplio also watched as Team Rocket appeared, who threatened to steal all their Pokémon, and how they were dragged by a Bewear. After Ash's Pikachu got hurt in a battle against Grubbin, Popplio went with her trainer away to report to Professor Kukui what happened.
As Ash went to school, he saw Lana training her Popplio. Popplio tried to make a watery balloon, but failed and fell in the sea. Once she arrived to school, Lana and Popplio heard that Lillie had a secret weapon for fishing. Popplio clapped and jumped into Lillie's lap. Lillie was terrified, so Lana took Popplio back and both apologized to Lillie. Once school was over, Popplio had a race with Pikachu on the beach and won. After Lana told Ash how she met Popplio, she had her emit water balloons, which splashed and soaked Ash. Regardless, she admitted she wanted to have Popplio make a big balloon so they could travel under sea and meet lots of water Pokémon. Ash was confident Popplio was capable of achieving that dream; Popplio tried to make one, but failed and soaked Ash and Lana. During fishing, Team Rocket stole the group's Wailmer and Lapras. Just as Pikachu freed the Pokémon from the net by using Iron Tail, the Pokémon were to fall on rocks. Fortunately, Popplio managed to emit a giant balloon, which saved the Pokémon, who dived into the sea. After Team Rocket's defeat, the group praised Popplio, who emitted one more balloon and enveloped Ash and Pikachu in it. However, the balloon soon splashed and made Ash and Pikachu fall down.
The class spoke about the Rattata and Raticate problem and found out the solution were Yungoos and Gumshoos. Their yelling startled Sophocles' Togedemaru, who ran in circles and knocked Popplio and Mallow's Bounsweet off the table. Pikachu managed to stop and calm her down, but Togedemaru started showing affection towards him. Popplio, along with her trainer, was at the party to celebrate Ash and his Pokémon's Grand Trial of Melemele Island victory. Lana and Popplio spent a day on the beach with Lana's classmates. After the class's task was over, Popplio emitted bubbles to play volleyball with.
Lana and Popplio participated in the Pokémon Pancake race. However, in the third part of the race, Mallow's Bounsweet accidentally bumped into Mimikyu. This caused Mimikyu to fire Shadow Ball on Lana's Popplio's bubble and pierced it (the attack was meant for Ash's Pikachu). This caused Bounsweet, Mimikyu and Popplio to be disqualified. The next day, Popplio watched as Lillie's egg hatched into a white Vulpix and Samson Oak's egg into a red Vulpix. While the white one, Snowy, ignored the group, the red one wanted to play with the others. The next day, after Lillie befriended Snowy and hugged it, Snowy was more interested in playing with the class's Pokémon. Lana and Popplio were at class when Ash explained how Rockruff came to the house wounded the other night. Popplio emitted a bubble, which splashed Bounsweet, Pikachu and Togedemaru. They also watched Ash train Rockruff.
Lana had her Popplio demonstrate creating a balloon and let Pikachu enter inside. Suddenly, Mallow's Bounsweet sneezed, causing Ash's Rowlet to be attracted to her. Bounsweet repelled the attack, causing Rowlet to be bounced away. Accidentally, Rowlet hit Popplio and the two entered the balloon, which flew off on the wind. Popplio tried to calm down Rowlet, who believed Ash deeply cared about it, and thought Lana would scold Popplio. Suddenly, Rowlet, again by accident, pierced the balloon, causing Popplio to fall down. Rowlet tried to grab it and fly away, but Popplio was too heavy for it. Thus, Rowlet and Popplio fell on Team Rocket, who were making a device. As Popplio and Rowlet started apologizing, the latter realized it had a strange ring around it and couldn't fly. James had Mareanie fire Spike Cannon, but was repelled by Popplio's Bubble Beam. As Rowlet and Popplio fled, Meowth and Mareanie chased after them, while Jessie and James were grabbed by Bewear. Popplio had to bounce Rowlet on top of its nose, but tripped over a rock, injuring itself and Rowlet. Meowth and Mareanie appeared, as the latter tried to attack the two. However, the two were rescued by Litten, who knocked Meowth and Mareanie out. Since they had nobody else to turn to, Rowlet and Popplio joined Litten, who took them to a place under the bridge. There, the old Stoutland licked Rowlet, sensing it was Ash's. Popplio confirmed this by clapping, but it was worried where they were even, and even hit Rowlet for getting them lost. Stoutland had Litten get Rowlet and Popplio to Ash's house, though Litten hesitated a bit. After walking through the city, the trio stopped to a building, where they were captured in a net by Team Rocket. Litten burned them with Ember though it wanted to join Team Rocket to let Popplio and Rowlet free. Team Rocket was touched by this and just as they went to unlock the cage, Litten betrayed them by freeing Popplio and Rowlet. Popplio fired Bubble Beam, wrapping Team Rocket inside the bubbles. The trio combined attacks, making Team Rocket blast off. Ash, Mallow and Lana arrived, pleased their Rowlet and Popplio were fine and safe, but also noted Litten's presence.
Lana had her Popplio practice making the balloon. Popplio created one, which Lillie's Snowy entered. Snowy was amused, as Popplio started to bounce the balloon up and down. Seeing Ash was taken inside Palossand, Lana had Popplio use Bubble Beam. However, Palossand recovered from the attack, due to its ability to become stronger from such attacks. Instead, Popplio went to search for the shovel and had Pikachu wrapped inside its bubble to help in the search. After some time, they found the shovel, but as Popplio emitted the bubble to take the shovel, a lot of Water-type Pokémon were in the way and got wrapped instead. After some tries, Popplio and Pikachu returned with the shovel and bounced off the bubble. With Litten's Ember, the shovel stuck into Palossand, and it stopped outraging. During the Pokébase match, Popplio and Lana were on Ash's team. Popplio conjured a bubble to grab the ball. It also used its fin to hit the ball Kiawe threw. However, Popplio's fin got hurt. In the next match, Lana hit the ball Kiawe threw hard, enabling herself and Popplio a home-run and a definitive victory.While going out camping, Popplio relaxed in the river. Due to Morelull's presence, Popplio fell asleep and was drained, along with others, except Lillie. Instead, everyone had dinner to end their hunger. Not soon after, the group encountered the Morelull, who, once again, made them asleep and drain them. Ash gave some of the energy to feed Morelull, and consecutively ate the curry Mallow made. Morelull was fed up and went to the tree, where everyone, including Popplio, watched as the Morelull evolved into Shiinotic. The Shiinotic Ash fed turned them asleep. The next day, however, everyone woke up and found themselves not hungry at all, seeing that Shiinotic returned the energy it drained from them. Before the class started, Popplio had a race with other Pokémon around the room, a race Pikachu won. During the exchange, Kiawe traded his Turtonator with Lana's Popplio. While working on the farm, Kiawe wondered what he'd do with Popplio, so Mimo decided to spend some time with it. The next day, Mimo reported the Tauros were fighting with each other. Since Turtonator was absent, Kiawe had Popplio emit the balloon to douse the Tauros, preventing their fighting. Kiawe was amazed, and had Popplio use Bubble Beam to wash the Tauros. Returning to school, Kiawe gave Popplio back to Lana and was impressed, seeing how Lana and her sisters cleaned Turtonator's back.
Olivia, who came to the Pokémon School, wanted to meet the heroes' Pokémon, and met Lana's Popplio. Popplio accompanied Lana, who was riding Stoutland to search for the treasures and bring them to Olivia. Since Stoutland disobeyed Lana, she and Popplio left it to sleep and search for the treasures on their own. Suddenly, Popplio was attacked by a Garbodor. Popplio used Bubble Beam to retaliate, and Lana took it and retreated. Lana tripped over a rock, and Garbodor caught up to them. Popplio used Bubble Beam to stop Garbodor, but was injured by its Sludge Bomb attack. Lana nevertheless thanked Popplio, and swore to protect it and Stoutland. The latter defended Lana and defeated Garbodor.
Popplio joined Lana and Ash to fish out a mysterious Pokémon lurking in Brooklet Hill. During the fishing trip, Lana encountered an injured Wishiwashi flopping around. Once it was healed, Lana went back to fishing. When all of a sudden, Lana's fishing line got hooked by a Totem Wishiwashi in School Form. Popplio was terrified by it due to its ginormous size. However, after seeing how much Lana is struggling to reel it in, it eventually conquered its fear and goes to battle it. During the battle, it got blasted away by an Alomomola. But Ash and Pikachu drove Alomomola away and Popplio proceeded to finish the battle with its newly learned move, Aqua Jet. Which also helped Lana clear the trial and earn a Waterium Z.
After obtained the Z-Crystal from Brooklet Hill, Lana and Popplio attempted to perfect the Z-Move, Hydro Vortex. But Popplio was unable to perform it correctly due to not syncing its poses correctly. Later, it met up with Ida and her Brionne and watched them perform in front of a large crowd of people. Lana and Popplio then decide to have some professional training with Ida and Brionne. The training consisted of Popplio trying to pop Brionne's water balloons. But despite failing constantly, Popplio completed its training. Later, when Lana and the gang encountered an angry Dhelmise, Lana and Popplio successfully executed the Z-Move and sent the Sea Creeper Pokémon packing.
Later, when Lana and her classmates visited Cerulean City as part of their Kanto field trip, Popplio teamed up with Steenee in a battle against Misty Psyduck. Steenee started with Magical Leaf while Popplio fired Bubble Beam. But Psyduck counterattacked with a blast of Water Gun. Popplio then created a water balloon during the battle and made Psyduck trapped inside of it. Misty commanded Psyduck to use Confusion, but nothing happens. Steenee attacked Psyduck with another Magical Leaf, but it breaks the water balloon and Psyduck falls in the battlefield, landing on its head. Psyduck's head injury causes it to suffer a headache, which allows Psyduck to fully execute Confusion on Popplio and Steenee. Before Psyduck to do anything to finish the battle, Misty called off the battle and told Psyduck that they had enough.
Later, when the group traveled in Ultra Space, Steenee, Popplio, Togedemaru and Charjabug along with Litten and Rowlet were sent out to battle Lusamine's Mismagius, Milotic and Lilligant. During the battle, Popplio performed Hydro Vortex to defeat Mismagius. But even though it looked like it successfully defeated it, Nihilego made it stand back up again. The battle ended with Ash and Pikachu defeating Nihilego with the 10,000,000 Volt Thunderbolt Z-Move, which sets all of Lusamine's Pokémon free.
Sometime later, Popplio helped Lana and her classmates complete several Ultra Guardian missions and helped Ultra Beasts return home. And in the process it meets a new friend who is also an Ultra Beast, Ash's Poipole.
When the adults in Alola started to act sluggish, Popplio went with Lana and her classmates to Poni Island where they are to investigate the strange phenomenon above the Altar of the Sunne. It helped power up Faba's machine and clear the skies with its Z-Power combined with Ash's Pikachu's, Kiawe's Marowak's and Gladion's Midnight Lycanroc's.
After travelling through the Ultra Wormhole, the Ultra Guardians enter a strange dimension that used to be the home of Ash's Poipole. As they search for Necrozma, they are attacked by wild Poipole, but Ash's Poipole stopped them and told them they're not bad guys. Just then, an old and weak Naganadel comes out and the Ultra Guardians rush over to help it, much to Gladion's dismay. After nursing Naganadel, Popplio, along with the other Pokémon, listened to its story about Necrozma's connection with the Blinding One, Ash's Poipole, and their homeworld. They learned that the reason why Necrozma possessed Nebby and Lunala was because it wanted a huge amount of Ultra Aura to restore its Ultra form and replenish Poipole's world due to the lack of its light. They also learn that Necrozma is actually the Blinding One the legends spoke about. Suddenly, the gang hears a crash outside and see Lunala still fighting with Necrozma. Gladion and Silvally attempt to defeat Necrozma, but they were immediately stopped by Ash and his classmates. They tell Gladion that if he drives Necrozma away, Naganadel, Poipole and its homeworld will die from the lack of light. Ash and the gang decide that the best way to save Nebby, help Necrozma, and replenish Poipole's world is to transfer their Z-Power. Together, Ash, Gladion, Kiawe, and Lana fired their Z-Moves at Necrozma.
But unfortunately for them, their attempt was unsuccessful. Instead of freeing Nebby, the Z-Moves only increased Necrozma's power and made it stronger. Necrozma goes to attack everyone, but is held off by Lunala. The Ultra Guardians learned from Professor Burnet that according to legend, Solgaleo, Lunala, and the people and Pokémon of Alola shared their Z-Power with the Blinding One when it lost its light. So, the Ultra Guardians as well as with the combined Z-Power of everyone in Alola as well as the Team Rocket Trio, the Guardian Deities, and the Island Kahunas, Necrozma gained enough light to free Nebby from its grasp. But despite their successful attempt, Necrozma became angry at their interference and attacked the Ultra Guardians in a blind rage. Hala, Olivia, and Nanu save the Ultra Guardians by transferring their Z-Power to Necrozma. But Necrozma wasn't giving up just yet. Necrozma then goes after Nebby and Lunala again, only to be held off by Gladion and Silvally. With Necrozma distracted, Lunala gave Gladion the Lunalium Z and Nebby recovers. Just as Necrozma was about to attack again, Ash and Gladion combined Nebby and Lunala's Z-Moves to help Necrozma provide enough Ultra Aura to return into its heroic Ultra form. Necrozma then uses its power to restore Poipole's homeworld to its previous majesty and disappears just as the solar eclipse ended. As they go to leave, the Ultra Guardians bid a tearful farewell to Poipole and returned back to Alola, while also witnessing Necrozma appearing above them in the sky.
Popplio helps Lana with her friends set up a haunted house for Harper and Sarah as they wanted to go to one. After finishing the haunted house for Harper and Sarah, Popplio helps everyone make it real for the girls but they were visited by real Ghost Pokémon then a Mismagius pulls them into a strange world. However, Popplio and everyone have been dreaming it but thanks to Lana and Acerola they were able to wake up.Later, Popplio was playing with her friends on the beach then she instantly formed an unbreakable friendship with a messy-haired Eevee that likes the ocean. Popplio and everyone all played with Eevee until she had go back to Lana with her friends as they also headed back to their trainers. While getting some malasada with Lana for a dinner to celebrate her farther's return from fishing, Popplio notices the same Eevee she befriended before in trouble when he was being chased by the Alolan Persian, who has caused a lot of trouble for her Trainer's friends in the past, and left on her own to go after him. Catching up to Eevee, Popplio was able to get her best friend away from the Persian that was chasing them by using Aqua Jet to make their escape a lot quicker. However, Popplio and Eevee fell into a stream but were happy that they got away from the Persian then swam away. Ending up in the outskirts of the city on the beach, Popplio became terrified when Eevee went over to some Pokémon that were playing on the beach as they belong to Team Skull. Popplio tried to save her best friend from Team Skull but Lana, Ash, Sophocles, Mallow and Lillie, who all been looking for her, showed up just in time to help. After saving Eevee from falling into the sand when Pikachu used Quick Attack to get the Team Skull grunts to let go of him, Popplio assures a worried Lana that she alright with Eevee coming over to her as well. Determined to protect her best friend, Popplio decided to battle Team Skull and learned Surf with Eevee, who wanted to help, using various Water-type Pokémon to get on top of the waves then used his Double-Edge attack to send the Team Skull grunts blasting off. Popplio praises and thanks her best friend Eevee for his help. After Kiawe, who was also looking for her, arrived, Popplio and Eevee were praised by Lana for their teamwork then both of them played in the water. Popplio was in her trainers arms when Lana formally asked Sandy, Eevee's nicknamed, if he wanted to join their team which he said yes to then witness her best friend being caught in a Dive Ball thus becoming teammates. After arriving home, Popplio with Sandy were playing around with Harper and Sarah then became happy to see that Lana's farther have arrived home. Popplio witness Lana giving Sandy a haircut to help him see better due to his shaggy hair being in the way of his vision.
Popplio arrived on Poni Island with Lana and her classmates for their individual research projects for class. Hearing that Lana's project was gonna be seeing Ida and catching up with her, Popplio became very happy that she was gonna see her good friend and mentor Brionne again. While waiting for Ida's arrival, Popplio and Sandy were playing in the water while Lana was fishing.
While at the Pokémon Center, Popplio looks out at the window and sees that Ida has finally arrived on Poni Island then goes with Lana to see her. Popplio became pleased that her friend/mentor Brionne has evolved into Primarina and spent the entire day training with her when her trainer reveals that they're gonna be traveling, despite mostly playing. At night, while hanging out with her, Popplio witness Ida and Primarina do their Z-Move Oceanic Operetta which she was very impressed with. Seeing that Lana wants to show Ida how much they have grown, Popplio spent the entire night training. In the morning before Ida leaves for her journey to see the world, Popplio and Lana showed her what they've accomplished by blowing a big balloon. Encouraged by Lana, Sandy and her friends, Popplio started to glow and evolved into Brionne.
After evolving, Brionne blowed away the huge balloon before it burst. Brionne then witnessed Ida, who became satisfied with their hard work, give Lana a Primarium Z-Crystal for her so she cane preform Ocean Operetta one day. Later, Brionne waved goodbye with her trainer and friends to Ida.
While their friends went to do their own thing, Brionne with Lana and Sandy went to the beach to do some more training despite being up all night doing it. Brionne was practicing blowing big bubbles again, only for them to pop, but Lana kept on encouraging her to keep it up. Later, Brionne, Lana and Sandy took a nap after training, all needing a rest from that all night training. Brionne along with Lana and Sandy reunited with their friends at the Pokémon Center.
Brionne later played on the beach with her trainer and friends, splashing water at Ash, accidentally causing him to step on Pikachu and electrocute himself, Ash, Lana, Sandy and herself as well. Afterwards, Brionne appeared along her trainer watching Ash battle Hapu and winning the grand trial. After reuniting with Professor Kukui when he arrived on Poni Island to pick up the group, Brionne shows herself to him as Lana reveals that Popplio evolved.
Later, Brionne helped Lana in PokéGolf by making colorful balloons while everyone dances around then helped her trainer make a shot. Brionne and her best friend Sandy teamed up to help their trainer make another shot.
Brionne joined in on an Ultra Guardian mission by stopping and catching a Pheromosa that has been stealing Z-Crystals from Trainers.
Later, Ash and his friends were spending a day off from school in Melemele Island's coral reefs. Sandy, Ash, Pikachu and Lana were playing in Brionne's bubbles while the others spent most of the day fishing. All of a sudden, Ash, Lana, and their Pokémon were caught in a violent whirlpool and were sent flying into a rocky reef. The cause of the whirlpool turned out to be the Legendary Pokémon, Kyogre. Ash and Lana were amazed to see it at first, but they discovered that it was poisoned and chased around by a hunter and his minions. After successfully defeating the villains and foiling their plans, Lana managed to cure Kyogre's poisoning with an antidote attached to the lure she got from Misty. However, despite being cured and saved from the hunter, Kyogre unleashed its fury and created a rainstorm in a blind rage. Kyogre then dragged Lana underwater while holding the lure in its mouth. Brionne tried to keep up with her trainer, but Kyogre was moving too fast. In a desperate attempt to save her trainer, Brionne evolved into Primarina and carried Lana to the surface.
As Kyogre continues its rampage, Lana decides that the best way to calm the angry Sea Basin Pokémon is to reel it in and have Primarina soothe it with her singing. After a brief struggle, Lana managed to reel Kyogre in and Primarina soothed its anger with her singing. With Kyogre calmed down and safe from danger, it bid Ash, Lana, and their Pokémon good-bye and swam off into the deep ocean. Lana and Ash later told the others about the event but found it hard to believe, thinking it was another one of Lana's jokes. However, Lana shows them that Primarina has evolved from Brionne, with Ash explaining what had happened, proving their adventures with the Legendary Pokémon was indeed for real.
When Mallow was working at Forest Pokémon Café to help Oranguru serve hungry Pokémon, Primarina and Sandy both helped Lana as extra waiters in Aina's Kitchen. Due to the countless customers who had come to dine, all three of them were worn out as a result when Mallow returned. Also, Primarina and Sandy with their friends were excited that their Trainers all have Z-Rings.
At Lillie's Mansion, Primarina and her friends were training for Alola League.
During the Alola League Primarina battle against Tsareena. In spite of her type disadvantage, Primarina was able to win the battle and allow Lana to move on to the quarter finals.
Primarina chosen to battled Guzma's Golispod. Primarina did her hardest, but Golisopod made it complicated for her due to its poison, which infected her voice and started poisoning her, due to her secondary type being weak to poison. After a fierce battle, Golisopd defeated Primarina. She was really poisoned really badly, but Shaymin managed to heal her quickly. Primarina was comforted by her trainer and her best friend before being called backed into her Poké Ball. During the semi-finals, Primarina and her best friend was then watching Ash battle with Guzma.
At some point during the Ultra Beast crisis, Primarina helped join everyone to defeated one of the Guzzlord at the Manalo Conference. 
At the end of the season, Primarina accompanied Lana to search for Manaphy with Lana's father.
- Rikako Aikawa (Japanese as a Popplio)
- Risa Shimizu (Japanese as a Brionne and a Primarina)
- Eileen Stevens (English as Popplio; SM001-SM062)
- Laurie Hymes (English as Popplio, Brionne and Primarina; SM063-present)
- Lana's Primarina shares few similarities as the previous Water-type Starter Pokémon:
- Like Brock's Marshtomp from Hoenn and Dawn's Piplup from Sinnoh, Primarina is the only Alola starter Pokémon to be owned by the main character other than Ash within a respective home series.
- Primarina is the third main Starter Pokémon to have evolved from the first stage within her series debut in her home region. First being Brock's Marshtomp when he evolved from Mudkip and second being Ash's Greninja when he evolved from Froakie into Frogadier. She is both second evolved main Water-type Starter Pokemon owned by one of Ash's companions as Brock's Marshtomp, and reaches a final evolution as Ash's Greninja within their home seasons.
- Primarina, Greninja, Piplup and Ash's Oshawott are the earliest Starter Pokémon of their element type who debuted in the first episode of their respective series. Additionally, Primarina and Greninja are polar opposites to Piplup and Oshawott respectively based on their evolution decisions and trainer’s ownerships.
- Primarina and Greninja accepted to evolve to final stage while Piplup and Oshawott refused.
- Primarina (as Popplio) and Piplup were recently owned by respective main female characters at the same time of their debuts, whereas Ash’s Water-type Starter Pokémon Greninja (as Froakie) and Oshawott are only owned by him in the some later episodes after their debuts.
- However unlike Piplup, Ash's Oshawott, Marshtomp and Greninja, Primarina is the only main female Water-type Starter Pokémon to appear, similar case with the main female Grass-type Starters from Johto, Ash's Bayleef (dub only), Unova, Ash's Snivy, and Kalos, Fire-type Starter Pokémon, Serena's Braixen due to also both being owned by one of Ash's female companions and evolved as well at most part.
- She is the second Water-type Starter that belonged to a main female character that has evolved. The first was May's Wartortle.
- Primarina breaks the record of the most earliest Water-type Starter Pokémon to be owned by one of the main characters prior the series, beating Piplup’s record.
- Like Misty's Politoed, Primarina likes to clap when she was a Popplio.
- In "Bright Lights, Big Changes!", Primarina's favorite food is seaweed salad, whereas "That's Some Spicy Island Research!" it is revealed that she detests the radish from Poni Island owing to its spiciness.
- In the segment of "Balloons, Brionne, and Belligerence!", Primarina dressing up as herself (as Popplio) has already foreshadowed her evolution into Brionne, followed by the foreshadow of her evolution into Primarina via Lana’s gift from Ida a Primarium-Z.
- Despite having to evolve and upgraded in the opening and ending in Japanese, Primarina was still featured as Popplio at the beginning of Your Adventure.
- Primarina is currently the only fully evolved Water-type starter Pokémon to be owned by a main protagonist and remain stays with her owner.
- Primarina is also the first fully evolved Water-type starter Pokémon owned by someone besides Ash.
- Primarina is considered as the first main female starter Pokémon to reach her final evolution.
- Primarina is also the only starter Pokémon owned by one of Ash's companions to fully evolve before his Starter Pokémon.
- Primarina is the third known fully evolved starter Pokémon owned by one of Ash's companions, first two being May's Blaziken and Venusaur.
- ^ a b SM061: A Mission of Ultra Urgency!
- ^ a b SM005: Yo, Ho, Ho! Go, Popplio!
- ^ SM001: Alola to New Adventure!
- ^ SM002: The Guardian's Challenge!
- ^ SM003: Loading the Dex!
- ^ SM004: First Catch in Alola, Ketchum-Style!
- ^ SM009: To Top a Totem!
- ^ SM010: Trial and Tribulation!
- ^ SM012: The Sun, the Scare, the Secret Lair!
- ^ SM013: Racing to a Big Event!
- ^ SM014: Getting to Know You!
- ^ SM015: Rocking Clawmark Hill!
- ^ SM016: They Might Not Be Giants!
- ^ SM017: Crystal-Clear Sleuthing!
- ^ SM022: A Shivering Shovel Search!
- ^ SM028: Pulling Out the Pokémon Base Pepper!
- ^ SM029: Lulled to La-La Land!
- ^ SM030: The Ol' Raise and Switch!
- ^ SM031: The Island Whisperer!
- ^ SM032: Treasure Hunt, Akala Style!
- ^ SM033: Big Sky, Small Fry!
- ^ SM040: Balloons, Brionne, and Belligerence!
- ^ SM043: When Regions Collide!
- ^ SM053: Rescuing the Unwilling!
- ^ SM054: 10,000,000 Reasons to Fight!
- ^ SM055: The Professors' New Adventure!
- ^ SM069: Rise and Shine, Starship!
- ^ SM078: Twirling with a Bang!
- ^ SM085: The Long Vault Home!
- ^ SM067: Love at First Twirl!
- ^ SM087: Filling the Light with Darkness!
- ^ SM089: The Prism Between Light and Darkness!
- ^ SM090: Securing the Future!
- ^ SM094: A Haunted House for Everything!
- ^ Where is Eevee Going?
- ^ SM099: We Know Where You're Going, Eevee!
- ^ SM104: That's Some Spicy Island Research!
- ^ SM105: Showdown on Poni Island!
- ^ a b SM106: Evolving Research!
- ^ SM107: Run, Heroes, Run!
- ^ SM109: A Grand Debut!
- ^ SM110: Keeping Your Eyes on the Ball!
- ^ SM114: Beauty is Only Crystal Deep!
- ^ a b SM120: The One that Didn't Get Away!
- ^ SM121: A Recipe for Success!
- ^ SM123: A Fiery Training Camp Trick!
- ^ SM127: Chasing Memories, Creating Dreams!
- ^ SM130: Battling Besties!
- ^ SM134: The Road to the Semifinals!
- ^ SM136: Getting Down to The Ire!
- ^ SM140: Z-Move Showdown!
- ^ SM146: Thank You, Alola! The Journey Continues!