Basculin

Basculin is a -type Pokemon introduced in Generation V and is set to appear in Pokémon Black and White. Its classification is the Violent Pokemon. It has two forms which are dependent on the version.

Appearance
Basculin has the look of a typical fish, with its bottom part being green and its top part being black, the two parts being separated by a bright red-orange stripe. It has spiky white fins. Its blue form, however, will replace the red-orange stripe with a blue one, and its fins and eyes have a sleeker design.

Trivia

 * Basculin appears to be based on a piranha.
 * Its name is probably a combination of Bass and Masculin.
 * Basculin was first shown within footage from the Pokmon Searcher BW tour on August 7th 2010. It was used by Cheren in the demo. It was officially revealed on the October issue of Coro Coro on September 11, 2010.
 * Basculin's Red Stripe Forme is exclusive to Pokemon Black Version while its Blue Stripe Forme is exclusive to Pokemon White Version, its forms do not change, it's the first Pokemon to do this.
 * Though with the use of the Super Rod or surf on a Rare Pokemon spot will always yield the opposite form.