While on the way to Mistralton City, the Sunglasses Krokorok appears and demands to battle with Pikachu. However, the resulting battle sends both Pokémon flying. Ash, Iris, and Cilan manage to track them down to a nearby town where they find Pikachu with a kid name Mick. Mick and his friends Glenn and Sean like to battle but Glenn never lets Mick battle since he has no strong Pokémon. Mick asks Ash if he can borrow Pikachu and battle his friends and Ash agrees. Ash then begins to train with Mick so he can battle properly. (thetvdb.com)