Poketto monsutâ - Season 6 Episode 40

At the Mauville Gym, Ash and friends are whisked away on a roller-coaster ride and confronted by an angry Raikou–a Legendary Pokémon from the Johto region! An attack from Pikachu reveals the Raikou to be a robot, which shorts out, showering Pikachu in electricity. When the battle begins, Pikachu defeats each of Gym Leader Wattson's Electric-type Pokémon with just one attack, and Ash wins the Dynamo Badge! Afterward, Ash learns from Nurse Joy that Pikachu won only because the robot's malfunction supercharged it with electricity. Our heroes set out to tell Wattson the match was a fluke, only to discover that he's abandoned the Gym in shame! They find him at an old power plant, where the Team Rocket villains are attempting to steal Electric-type Pokémon. Ash and Wattson team up to defeat them, and when Ash tries to return his Gym badge, Wattson tells him to keep it as thanks for helping him free the Pokémon.