From Bulbapedia, the community-driven Pokémon encyclopedia.
Pikachu Fan is a type of Trainer that first debuted in Generation IV. So far, they have only appeared in Pokémon Battle Revolution. They're available in all character models and use Pikachu themed outfits. They use Electric-types the most. A custom character can be of the Pikachu Fan Trainer class if they are wearing the entire Pikachu themed outfit.