Having arrived in Aspertia City, Ash & co. find out a new gym has recently opened up there with a new Gym Leader, Cheren. With the Gym behind the trainer school, Ash & Co. help Cheren out with teaching the various kids there. However, when Axew gets lost, its cries for help spook the other Pokémon in the school and they run off. It's up to Cilan to find them. Meanwhile, Ash and Cheren decide to battle. Will Ash manage to defeat the new Gym Leader?