Judgment Day - S7.E52

Due to a mistake, the heroes sail away to an island, with their actual destination being Mossdeep City. On the island, they find Jimmy, who trains to become a judge. With teacher Serena's help, Jimmy tries to be the referee of a Double Battle of Ash vs. Brock. After the battle, Jimmy recalls his past before he has to rescue his Pokémon, who were stolen by Team Rocket.