Basculin

Basculin (Japanese: バスラオ Bassrao) is a Water-type Pokémon introduced in Generation V.

While it is not known to evolve into or from any other Pokémon, it does have two different appearances: Red-Striped Form, which has a red stripe and irises, with a round eye and spiky fins; and Blue-Striped Form, which has a blue stripe and irises, with a slit eye and smooth fins.