Pokemon Season 7 - Episode 334 – Disaster of Disguise

May hears from Drew that his Roselia was badly injured by a masked trainer's Dusclops. Eventually, Ash, Brock, May and Max find this trainer themselves, but soon discover it is a kid named Timmy. Apparently his mother loathes Pokémon, and he masquerades as the Phantom Coordinator in order to get in training. They decide to help him find a way to compete in the next Pokémon Contest.