- Previous episode S18E86 - I Choose Paradise!
- Number S18E87
Filling the Light with Darkness!
One morning, as a mysterious cloudy weather covers Alola, Ash notices that Professors Kukui and Burnet are feeling listless. Once he gets to the Pokémon School, he talks with his classmates, and it appears their mothers and fathers are feeling the same way. The Ultra Guardians are dispatched in order to investigate this mystery, but then a new member of the team appears.