From Bulbapedia, the community-driven Pokémon encyclopedia.

A Bodybuilder (Japanese: にくたいは Bodybuilder) is a type of Pokémon trainer that first debuted in the Generation III games, appearing in Pokémon Colosseum. They are muscular, tall men and women in exercise outfits. Like many of Orre's trainer classes, they don't specialize in any particular strategy or Pokémon.