Pokémon (1997)

S04E35 The Wayward Wobbuffet

Title: The Rogue Wobbuffet Plot: A frantic chase ensues as Team Rocket's Wobbuffet bolts away with the crucial key to a cage that is said to be unbreakable... and inside is Ash's precious Pikachu! The team must track down the mischievous Pokémon before Pikachu is trapped forever.