Battling the Enemy Within

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Humans

 * Pyramid King Brandon
 * Samuel

TV episode debuts

 * Regirock

Major events

 * Ash, May, Max and Brock arrive at the Battle Pyramid and meet Pyramid King Brandon, the seventh and final Frontier Brain.

Humans

 * Ash
 * May
 * Brock
 * Max
 * Jessie
 * James
 * Scott
 * Pyramid King Brandon
 * Samuel
 * Diggers
 * Storyteller

Pokémon

 * Pikachu (Ash's)
 * Meowth (Team Rocket)
 * Wobbuffet (Jessie's)
 * Mime Jr. (James's)
 * Salamence (Ash's)
 * Regirock (Pyramid King Brandon's; Debut)
 * Seviper (Jessie's)
 * Cacena (James's)