Ash Ketchum

Ash Ketchum is Kamen Rider Pika. He first appeared in Kamen Rider Taisen Infinity.

Pre-Kamen Rider Taisen Infinity
Ash's history is basically the same as it is in the actual Pokemon series until after the Pokemon League. Some point after the Pokemon League, Ash somehow got the Poke Driver and became Kamen Rider Pika.

Kamen Rider Taisen Infinity
Ash appears in Kamen Rider Taisen Infinity to assist in the battle.

Forms
Ash uses the Poke Driver and specialized Poke Balls to transform into his different forms.

Trivia
Kamen Rider Pika's suit is retooled from Kamen Rider Beast.