Some strange signals have started coming from Wela Volcano which are interfering with the process Lusamine uses to track the Ultra Wormholes so she sends the Ultra Guardians to Wela Volcano to investigate. However, instead of finding more Ultra Beasts, they instead find a group of Alolan Geodude & Graveler who appear to be taking food from the humans. Will they be able to solve the mystery?

Ash has decided to explore more of Melemele Island when he meets a trainer called Hau, who turns out to be the grandson of the Island Kahuna, Hala. He mentions that he and his partner Pokémon, Dartrix, are currently training for the Grand Trial and gets excited when he learns ash has already beaten it. After seeing Rowlet's evolved form, Ash challenges Hau to a battle. Who will win?