Basculin

Basculin is a Water-type Pokémon introduced in Generation V, native to the Unova region. Known for its aggressive nature, Basculin is unique in that it has two distinct forms: Red-Striped and Blue-Striped, each with slightly different temperaments and abilities, although they are the same species. These forms are often depicted as rivals, rarely coexisting peacefully in the same waters, though occasionally members from different schools might mingle. Basculin typically inhabit rivers and lakes, where they are fierce predators, known for their strong bite and territorial behavior. They do not evolve from or into any other Pokémon, making them a standalone species. In the games, Basculin are often encountered as common fishing Pokémon, and their different forms can sometimes be found in specific locations or depend on the game version. They have also made appearances in the Pokémon anime, showcasing their schooling behavior and competitive spirit. Despite their commonality, their distinct forms and lore regarding their rivalry add a unique flavor to their presence in the Pokémon world.