Due to being the Gratitude Pokémon, Shaymin likes to see the gratitude from both people and Pokémon, shown when it was attracted to Mallow's gratitude towards her late mother. Also, Shaymin instantly bonded with Mallow as it was very grateful that she decided to take care of it until the next Gracidea Flower season came so it can change into its Sky Form and fly off. Shaymin even formed an unbreakable friendship with Tsareena, Snowy and Sandy as it likes being with them. Also, Shaymin became friends with the rest of the Pokémon that belong to Mallow's friends. Shaymin is also shown to be helpful as it enjoys helping in Mallow's family restaurant, kept Sandy from getting hurt and went looking for Mallow's headband.
Shaymin was found behind the recently growing rose by Mallow and her Tsareena, after the spirit of Mallow's mother fades away and leaves to the afterlife after their brief reunion when the fog faded away. Shaymin was brought by Mallow and Tsareena as they introduced it to their friends. Having already taking a liking to her, Shaymin accepts Mallow's offer to stay with her until it awakens its Sky Forme someday.
Shaymin later witnessed Tapu Fini's ritual of Hapu becoming Poni Island's new Island Kahuna. It later watched Ash and Pikachu's grand trial against Hapu and her Mudsdale, which the latter emerged victorious and won the Steelium Z. Shaymin was introduced to Professor Kukui, who arrived on the island to pick everyone up, by Mallow then left Poni Island with her and began traveling to Melemele Island with her.
While Tsareena is too busy helping Mallow’s father Abe, Shaymin is the only Pokémon who joins its friend to the windy Malie City. It rescues its friend Sandy from being hit by car. When Mallow’s bandanna got caught by a strong wind, Shaymin follows it, followed by Sandy and Ash's Meltan who accompanied it. After getting Mallow’s bandanna, they are trapped by Team Rocket, who forget that Meltan can swallow their metal traps before surrounding the three Pokémon before they escape, leaving Shaymin protected by Sandy and Meltan before Mallow, Ash and Lana arrived. Shaymin heals Sandy quickly upon the latter was hit by Sludge Bomb from James' Mareanie. After Bewear and Stufful drags Team Rocket away from the battle, Shaymin give Mallow her bandanna back.
Shaymin later watched Ash and Kiawe's battle against the Gym Leader of the Kantonian Gym, Ryuki. While Kiawe lost the first part of the battle with his Marowak, Ash managed to defeat Ryuki in a double battle with Meltan and Rowlet.
Sometime later, Shaymin watched Sophocles and his Vikavolt participate in the Vikavolt Race, which they won and received the Buginium Z. After the race, Shaymin witnessed Hapu giving Sophocles a Z-Ring for his valiant efforts of saving the other contestants' Vikavolt from Team Rocket.
Shaymin later helped Mallow and Tsareena in Oranguru in serving the hungry Pokémon in the Forest Pokémon Café. But at the end of the day, Mallow's biggest challenge was cooking for the Tapu Guradian, Tapu Koko. Mallow didn't want to at first, but with the support of Oranguru, Shaymin, and Tsareena, she managed to make a satisfying meal for it. Tapu Koko rewarded Mallow the Grassium Z for helping Oranguru in its café while Oranguru gave her a Z-Ring. When they returned to Aina's Kitchen, Shaymin, Tsareena and Mallow were surprised that their friends helped out at the restaurant while they were gone. After Olivia fixed up Mallow's Z-Ring, Shaymin, Tsareena and their friends were excited that Mallow along with her friends all have Z-Rings.
At the school, Shaymin watched Mallow and Tsareena practicing their poses for their Z-Move, along with their friends. At Lillie's Mansion, Shaymin was then seen having lunch with its friends. Sometime later, Shaymin was training at Lillie's place for the Alola League alongside its friends.
During the Alola League, Shaymin was used in a Battle Royal during the first round and one of 16 competitors to move to the finals. Shaymin later watched the rest of the Alola League with Mallow, her classmates, and the other Pokémon.    
At some point during the Ultra Beast crisis, Shaymin helped join everyone to defeated one of the Guzzlord at the Manalo Conference. 
After the Alola League and bidding farewell to Its friends, Shaymin turned into its Sky Form while getting in contact with the Gracedia flowers Ulu bought. Then, three Shaymin appeared from outside Mallow's restaurant and departed after saying goodbye to Mallow, her family and Tsareena.
- Lori Phillips (English)
- Being one of the few Pokémon under care of the main characters without catching them with Poké Balls, Shaymin appears to share similar case as Misty's Togetic (when it was a Togepi), Squishy, and Nebby (prior evolving into Solgaleo). Due to this, Shaymin is the very first Mythical Pokémon to be part of the main cast, accompanied by a fully owned Mythical Pokémon, Ash's Melmetal, and its fellow watching over Pokémon Magearna.
- As a member of Ultra Guardian, Shaymin is the only known genderless Pokémon to wear a ribbon that is commonly synchronized to be used by the confirmed female Pokémon members of Ultra Guardians, unlike Ash's Naganadel and Melmetal, who are listed as “males”.
- Shaymin is also one of the known expanded Pokémon of Ultra Guardian, who is not one of its original founding Pokémon, the others are Lana's Eevee, Naganadel and Melmetal.
- Despite being genderless, this Shaymin's Sky Forme has eyelashes akin to females, whether this means Shaymin's gender-based ratios being updated or remained genderless is unknown.
- ^ SM108: Memories in the Mist!
- ^ SM109: A Grand Debut!
- ^ SM110: Keeping Your Eyes on the Ball!
- ^ SM111: Show Me the Metal!
- ^ SM112: Got Meltan?
- ^ SM113: This Magik Moment!
- ^ SM115: The Dealer of Destruction!
- ^ SM116: The Secret Princess!
- ^ a b SM117: Drawn with the Wind!
- ^ SM114: Beauty is Only Crystal Deep!
- ^ SM118: Aiming for the Top Floor!
- ^ SM119: A High-Speed Awakening!
- ^ SM120: The One that Didn't Get Away!
- ^ SM121: A Recipe for Success!
- ^ SM122: Spying for the Guy!
- ^ SM123: A Fiery Training Camp Trick!
- ^ SM127: Chasing Memories, Creating Dreams!
- ^ SM129: Battle Royal 151
- ^ SM130: Battling Besties!
- ^ SM131: The Battlefield of Truth and Love!
- ^ SM132: Imitation is the Sincerest Form of Strategy!
- ^ SM133: Battling on the Wing!
- ^ SM134: The Road to the Semifinals!
- ^ SM140
- ^ SM146