Ash has completed three of his four grand trials in the Alola region, and more adventures await as he and his classmates acquire new Z-Crystals, make new Pokémon friends, and learn how to Mantine Surf! In their role as Ultra Guardians, the Pokémon School students take on an important mission to protect Wela Volcano. Ash meets a new rival, Hau, whose Dartrix offers Rowlet quite a challenge. Even Rotom Dex gets an adventure of its own when our heroes visit the set of its favorite TV show! And Professor Kukui's dream of starting a Pokémon League in Alola just might be getting closer to reality...