The King of Pokélantis is a minor character who appeared in Battling The Enemy Within! and is the main antagonist of the episode.
The King lived a long time ago as the evil ruler of Pokelantis. It is unknown how he fell from power.
Season 9: Battle Frontier
Ash and his friends met Brandon, the Pyramid King, in the ruins of the Pokelantis. When Ash and Pikachu get separated from the others, he found a giant statue of the King. Ash discovers a stone orb in the shape of a Poké Ball and wonders if the legendary Pokémon, Ho-Oh was in it. But when Ash held the orb up and tries to call out Ho-Oh, it turns out that the orb only contained the spirit of the evil king that ruled Pokélantis before being sealed away.
The evil spirit of the King took over Ash's body and attacked his friends. Brandon battled him with his Regirock against Ash's Sceptile. Sceptile fainted and the King tried to force Pikachu to battle, but May, Max, and Brock stepped in front of him to guard Pikachu. The King demands Pikachu to use Thunderbolt on them. Suddenly, Ash, in his mind, tells Pikachu to use Thunderbolt on the King.
Pikachu uses Thunderbolt on the King. The evil spirit is forced to leave Ash, awakening him. Once Ash was freed, Brandon sealed the evil king's spirit back into the stone orb.
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In the Japanese and English-language versions of the anime, the King is voiced by Unshō Ishizuka and Rodger Parsons, both of whom also voice the Narrator for the respective versions of the Pokemon anime itself.