Pokémon: Indigo League
The Ninja-Poké Showdown (1x32)
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The group finds a strange-looking ninja-style mansion. They explore it and encounter various traps. Soon, they discover that this is the Fuchsia Gym and Ash battles Koga, the Gym Leader, for the Soul Badge. When Team Rocket disrupts their battle, Misty discovers how powerful her Psyduck really is.