Satoshi and friends have returned to Miare City, where they run into Citron and Eureka's father Limone. Satoshi is told that Citron is really the Gym Leader of the Miare Gym, and that the Gym has been taken over by Citron's own invention, "the Citroid". In order to take the Gym back, Satoshi, Citron and the others sneak into the Miare Gym and challenge the Citroid to a Pokémon battle.