Pokémon Season 5 Episode 15

As Ash prepares for his Olivine Gym battle, he and the others come across a giant Wobbuffet. It turns out to be a Team Rocket "Wobbu Warrior" robot, used for—what else?—trying to capture Pikachu. Jasmine's Steelix comes to the rescue, cracking the robot's shell, freeing Pikachu, and sending Team Rocket blasting off again.