Team Plasma's Pokémon Power Plot! - S16.E15

When Team Plasma scientist Colress uses his machine to draw out Pokémon strength, the controlled wild Pokémon attack the residents of nearby Floccesy Town. Ash, Iris, and Cilan get caught in the middle of the mayhem when Pikachu and Axew also fall under his control, but when they are saved by Looker, they agree to aid him in his investigation of Team Plasma and Colress's scheme.