Pokemon the Series: Ruby & Sapphire Season 903 Episode 9 Battling the enemy within

Our heroes have just caught a glimpse of the Battle Pyramid when the ground collapses under their feet! They find themselves in an ancient ruin underground. Curious, Ash picks up a statue of a Pikachu, which sets off an enormous boulder trap! They take off running and bump into Brandon, the Frontier Brain of the Battle Pyramid, who scolds them for messing with things they don't understand. The message doesn't register, however, and when Ash picks up a stone sphere, he is possessed by the angry spirit of the ancient king of Pokelantis! The king demands that everyone give up their Pokemon, and Brandon challenges him to a battle. Brandon appears to be losing, until Ash regains consciousness. After a struggle to reclaim control of his own body, Ash asks Pikachu to use Thunderbolt on him--which knocks Ash unconscious and drives out the evil king! Brandon and Ash make plans for a rematch after the Grand Festival.