From Bulbapedia, the community-driven Pokémon encyclopedia.
Fairchild Island (Japanese: デカポケ島 Dekapoké Island) is an island in the Orange Archipelago.
Fairchild Island is a mixture of forested and rocky terrain. Tracey suspected that the island's giant Pidgeot and Rhydon reached to their current gargantuan sizes because of Fairchild Island's fruit-filled forests. There are many resident wild Pokémon that will attack anyone who makes their way onto the island.
In Bound for Trouble, Meowth and Ash's Pikachu were bound together by a rope after Team Rocket tried to once again steal Pikachu. However a giant Pidgeot swooped in and grabbed the bound pair. Pikachu managed to free them from Pidgeot's talons with a Thunderbolt, but still had to contend with the island's giant Pokémon while trying to reunite with Ash.
Pokémon seen on Fairchild Island