A Biker is a trainer class. They are rowdy young men riding "bikes" although they appear to be motorcycles. In Generation I-III, they are depicted as skinny young men riding a motorcycle but by Generation IV, they have been buffed up as tougher and bigger Bikers. They are commonly found hanging out with Roughnecks. In fact, some Bikers and Roughnecks battle you together.
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In the mangaIn PMBW01, a biker called the Bousouzoku (Biker) King challenged Monta and Cheren to a battle, 1 vs 2. He sends out his Wargle to battle. Though Wargle damaged Monta's Snivy and Cheren's Tepig a lot, they uses an Oran Berry to help their Pokémon heal themselves. Monta and Cheren tell their Pokémon to use a Combination Technique on Wargle and Wargle fainted as a result.
- A Biker in Pokémon Black and White challenges you in a triple battle.
- In Japanese, they are called Gangsters, Wild-riding Gang or Bousouzoku.