After Ash & Torracat inadvertently got sent into the past by Celebi, Pikachu and the others are unaware and can't find Ash so decide to start searching for him. Their search takes them to the Pokémon School, Ultra Guardians base and even in the sky with Garchomp. What adventures await Pikachu and the other Pokémon, and will they be able to find Ash?

It's time for the opening of the Alola Pokémon League and the group have arrived at the stadium to register. The expectations for the league heat up as reveryone's rivals appear in quick succession. However, soon Guzma and the rest of Team Skull appear and start causing trouble, especially when Team Rocket also appear. This leads into a delve into the history of Guzma and Kukui. What happened between them in the past and can the League continue?