The Sun and Moon series follows Ash Ketchum on his new journey in Alola with his companion, Pikachu. He and his mother, Deliah, leave for the Alola region on a vacation. However, once seeing the Pokémon School, Ash decides to stay in Alola on a new journey.
From there he adventures across the region with his new RotomDex, as well as his new classmates.