This Sirfetch'd is a Fighting-type Pokémon owned by Ash Ketchum and the first Pokémon he caught in the Galar region, as well as the fourth Pokémon he caught during his journey around the world with Goh.
Sirfetch'd is an experienced battler who aims to become a "Leek Master" as he wants become the mightiest fighter, an expert at fighting with his Leek.
As a Galarian Farfetch'd, Sirfetch'd was very competitive who's always looking to push his limits, even when he's at a disadvantage. Also, similar to his teammate Lucario, as a Riolu, Sirfetch'd, while he was a Galarian Farfetch'd was known to pick fights with other Pokémon prior to being captured. He's shown to be cold and aloof towards Ash. He is mostly known for making a "bring it on" ("come on" in Japanese) gesture when challenging his opponents to a combat.
Similar to Ash's Charizard in his disobedience phase, Sirfetch'd, while he was still a Galarian Farfetch'd wields a great deal of power and wished to pursue getting stronger alone. According to Rinto, despite his power, Sirfetch'd lacks synchronization.
He is normally on friendly terms with his Kantonian counterpart, but they will dispute with each other when conflicts arise. For instance, he once nearly fought with Kantonian Farfetch'd after mistaking the latter for eating his curry.
Upon evolving, Sirfetch'd fully ascend into a knighthood. He began displaying a much more chivalrous and gallant demeanor, as he once protect his Trainer from being wet when a car almost splashes some water of him.
Sirfetch'd always keep training to master his techniques with his Leek and tries to work together with his Trainer when he agree to help achieved his dream.
After battling with Ash and his capture when he was a Galarian Farfetch'd, they both share a love of battling and mostly obeys his Trainer's command in battle. Despite that, he can be cold and aloof towards Ash, striking him with or pointing his leek towards him. And yet, he starts to understand that his Trainer wants to become stronger together as Ash wishes to get stronger along side him. Upon seeing his Trainer's selfless act to save him and help him, Sirfetch'd started to bond with Ash and protected him when he needed it the most. After his evolution into Sirfetch'd, he has gained more trust and bond with each other and is very loyal to Ash.
Sirfetch'd seems to be on good terms with Pikachu as he conducted him a very good friend to have. Also, Sirfetch'd appreciates Pikachu's support for him.
Sirfetch'd doesn't have much a relationship with Dragonite but does care about it and considers it a good friend to have. In addition, Sirfetch'd does seems to be impressed with Dragonite's strength and compassion for others.
Although he isn't close to it, Sirfetch'd has shown to get along with Gengar and does sees it as a friend. Also, Sirfetch'd doesn't usually train with Gengar because of their Type match ups.
Ever since meeting and battling it as a Riolu, Sirfetch'd has come to consider Lucario its sparring partner, much like Ash's Scraggy being sparring partners with Iris' Axew. Also, Lucario and Sirfetch'd do have a rivalry with each other but they not only see each other as friends but also teammates.
Sirfetch'd doesn't have much a relationship with Dracovish but does see it as a friend and teammate.
Ash's Sirfetch'd appears to have a mutual rivalry with Goh's Kantonian Farfetch'd. While the two are normally friendly to each other, they are prone to bickering, which leads to them clashing with their leeks.
As Galarian Farfetch'd
Before encountering Ash and Goh, Farfetch'd had managed to defeat a Trainer's Chewtle. Goh tried to catch him and ordered his Kantonian Farfetch'd to battle against him, but both attempts failed due to the Galarian Farfetch'd being more experienced. In the beginning, Farfetch'd saw through the strategies of Ash's Riolu and beat it up.
However, Farfetch'd was beaten by Riolu, who after some encouragement from Ash, turned the tables around. Farfetch'd was cheered on by Ash and wanted to continue, but ended up passing out due to fatigue. After being healed at a Pokémon Center, Farfetch'd was deeply impressed by Ash's battling skills, and allowed himself to be captured by him. After being brought out of his Poké Ball, Farfetch'd sparred with Riolu as he came to see it as a good training partner.
Farfetch'd was later seen eating breakfast with the group. However, a wild Sobble is secretly stealing food, Farfetch'd believed that Goh's Farfetch'd stole the food. When Sobble revealed itself, it became timid and cried excessively, making everyone, including both Farfetch'd, crying. It went on a search party for the Sobble and found it hiding in the water fountain where Goh unintentionally captured it.
Farfetch'd was brought out for training practice to train against Riolu but was quickly taken out by Riolu's Reversal.
Ash later brought out Farfetch'd during the first round of his World Coronation Series battle against Bea. He went up against her Hawlucha. In the end, Farfetch'd lost due to the fact that he couldn’t stop the momentum of his leek, leaving him open to Hawlucha's Flying Press, which knocked him out. After Ash lost the battle, he apologized to Farfetch'd and Riolu, promising they would get revenge and win the next time they meet. 
Farfetch'd later helped Ash's Riolu in his training in order to win against Bea in a rematch.
Farfetch'd later joined Ash as they headed to the Rock Tunnel, where a mass outbreak of Geodude was taking place, in order to train there. Once they arrived Farfetch'd began to train on his own by smashing some rocks. He tried to master its moves with his leek, aiming to become a Leek Master. During training, they encountered a Trainer, Genba, whose partner was a Gurdurr, and decided to have an official World Coronation Series match with them. As they began their battle, Farfetch'd went all out with the power from its leek and Gurdurr's steel beam. As the fight went on, a Trainer named Rinto and his partner Gallade watched Farfetch'd fight while he he see how it and Ash wasn't in total sync. Farfetch'd then ended the match by taking out Gurdurr when they clashed with Brutal Swing, and causing Gurdurr's steel beam to break, thus winning the match. After its victory, Farfetch'd continued to train itself when Ash watch see what's bothering it. Then, Rinto and his Gallade showed up and greeted Farfetch'd and Ash. Rinto told them that he believed that something was lacking between their bond during their battle and asked Ash and Farfetch'd to have a battle against him and his Gallade, which they accepted. Once the battle began, Farfetch'd went on full throttle attack on Gallade, only for the latter to dodge all of them with ease. As Farfetch'd continued to attack, Gallade managed to knock out Farfetch'd with one powerful move, False Swipe. Farfetch'd was tended by Ash while Rinto pointed out that Farfetch'd had a lot of potential and power, but still needed to have a complete sync with Ash. As Rinto and his Gallade left, he asked Ash and Farfetch'd for another battle once the two are in unison. Back home in Cerise Laboratory, Ash and Pikachu decided to train together with Farfetch'd, helping it to get stronger and hopefully have a rematch with Rinto.
Farfetch'd later joined Ash to the Kalos region where they can be trained by Wikstrom in the Hall of Chivalry, along Goh and his Scyther. During the second challenge, Farfetch'd and Ash when through the maze of doubts where Farfetch'd is only focus completing the challenge and not even by Ash when was injured of was trying to save it by one of Wikstrom's Pokémon. However, Farfetch'd then fell into a trap hole, and Ash came to its aid and pulled it up, but it dropped its leek in the process. Realzing this Ash quicky take Farfetch'd out of the hole while jumped down and managed to return the leek to Farfetch'd. In the third and final challenge, Ash, Farfetch'd, Goh, and Scyther battle both Wikstrom and his Aegislash while trying to retrieve a Key from Wikstrom's Klefki. As Goh and Scyther chase after Kelfki, Farfetch'd took on Aegislash, while Ash himself engaged Wikstrom in a swordfight. When Ash started to get overpowered, Farfetch'd remembered Ash's selflessness while saving it and retrieving its leek and decidiced to defended him from Wikstrom's sword, at the cost of taking a hit from Aegislash's Sacred Sword. However, Farfetch'd then learned a new move: Detect and was able to use it to evade a second Sacred Sword. Farfetch'd then followed through by hitting Aegislash with Night Slash and was prepared to finsih it off until Ash told it to stop as Goh and Scyther were able to retrieve the key and win the challenge. After completing Wikstrom's training, they were able to recieve Knight's medals from WIktrom and witnessed Goh's Scyther evolve in Scizor as well. After that, Ash told Farfetch'd that will beat Rinto and Gallade the next time and win, with Farfetch'd happily agree as he began to bond more with Ash from their recent adventure.
Farfetch'd was training with Goh's Scizor until they were exhausted as their Trainer's decided to take them to the Pokémon Center. After getting heeled at the Pokémon Center, Farfetch'd encounters Rinto and his Gallade again as there in the World Coronation Series and Ash challenges them to a battle, which they accepted. However, during the battle, Farfetch'd leek got split into two. Seeing this, Farfetch'd was devastated. However, Ash not only encouraged it but also gave it the idea of using the split off piece of its leek as a shield. Through the battle, Farfetch'd landed some critical hits. When Gallade was going to land another attack, Farfetch'd started to evolve into Sirfetch'd.
After evolving, Sirfetch'd used its new skills to give the upper hand on Gallade and was able to beat it. Through this victory, Sirfetch'd helped Ash's rank in the World Coronation Series to go up.
- As a Galarian Farfetch'd, Sirfetch'd marks the first time Ash had caught a regional form of a previous Pokémon.
- It was also the first regional form Pokémon to evolve.
- It is also the first Pokémon owned by Ash that he caught from the Galar region.
- Since evolving, Sirfetch'd is marked as Ash's second Generation VIII Pokémon from the Galar region, with the first being Dracovish.
- It was also the first regional form Pokémon since the Sun and Moon series to appear and is the third Pokémon to join the cast, with the first two being Snowy and Kiawe's Marowak.
- Sirfetch'd is Ash's first capture in a brand new region since his Heracross in Johto that isn't a type or a Starter Pokémon. Coincidentally, they are both are Fighting-type Pokemon.
- While it isn't an actual type, it is still a bird, keeping that tradition alive.
- Sirfetch'd is Ash's first Pokémon to know a Dark-type move that is neither Bite nor Crunch.
- Sirfetch'd is Ash's second Pokémon after his Incineroar to faint standing up.
- Sirfetch'd is currently Ash's only Pokémon he caught during Pokémon Journeys: The Series that's not dual-type.
- As a Farfetch'd, Sirfetch'd marks the first time Ash had caught the same Pokémon as his current travelling companion, though Goh caught the Kantonian Form of Farfetch'd while Ash caught the Galarian Form.
At Oak's Lab
At Kukui's house
At Cerise Laboratory