Fletchy debuted as a Fletchling in PS549, where she was seen flying to X's house alongside Y in an attempt to get X out of his house. In the next round, Fletchy escaped Vaniville Town alongside her Trainer to escape the destruction caused by Xerneas and Yveltal battling each other.
In PS551, Y and Fletchy battled the Team Flare member that trapped them inside an Aquacorde Town inn. When Y noticed that X was in trouble outside, she attempted to open the window to help him but was unable to. Seeing this, Fletchy smashes the window with her beak, allowing Y to break through to get to X.
Fletchy and Y
In Overthrowing a Tyrunt, Fletchy battled alongside Croaky, Tierno's Corphish, and Shauna's Skitty against Team Flare Grunt's four Espurr. Due to learning that her mother was kidnapped by Team Flare, Y became distracted, which gave the Espurr an advantage in the battle. The Espurr were later defeated when Cassius arrived and used his Gourgeist to confuse them. After the group was taken to Cassius's house, Fletchy looked at her Trainer sadly when she noticed that Y had become depressed from the knowledge of her mother's fate.
In Burning Fletchinder, Fletchy battled Yvette, a former classmate of Y's that had been put under mind control along with other Sky Trainers. During the battle, Yvette repeatedly taunts and mocks Y by insulting her mother. This action angers Y into defending her mother, which helped get her out of her depression. Now calmed down, Y's passion for defeating Yvette helped Fletchy to evolve into Fletchinder, giving her the strength to defeat Yvette's Vivillon. With X defeating the Aegislash that put the Sky Trainers under mind control, Yvette passes out, forcing Fletchy to catch her and lift her to safety.
Fletchy is a kind and free-spirited Pokémon, though when she goes into battle, she becomes focused and determined to defeat her opponent, no matter what the opponent may be. Fletchy is very smart and insightful, and usually acts without needing her Trainer to tell her what to do. She deeply cares for Y, becoming sad when her Trainer was depressed. Flecthy is not normally used by Y for battles and instead used for flight transportation.