Basculin

Basculin is a Water-type Pokémon.

While it is not known to evolve into or from any other Pokémon, Basculin has 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.

Biology
Basculin is a green aquatic Pokémon that comes in two forms. The bodies of both the Red- and Blue-Striped Forms are the same. They have a green, ovoid body, tapering off in the rear to a trapezoidal tail fin. A thick black stripe covers the top of their body from mouth to tail and a white, dorsal fin with four protrusions resembling spikes. Their lower jaw juts ahead of their upper jaw, with a small indent near the edges of their mouth. Both forms have three black dots on both sides of their body, behind their pectoral fins.

The main difference between the two forms of Basculin is the color of the stripe that separates the black and green on their body. Both forms of Basculin have fins in the same places, with one on top of their body ahead of the tail fin, one below the body ahead of the tail fin, and two side fins. The Red-Striped Form has jagged fins that resemble tridents, whereas the Blue-Striped Form has smooth fins all around. The Red-Striped Form have circular, red eyes, while the Blue-Striped Form have narrower, blue eyes.

Both forms of Basculin are extremely hostile, especially towards their opposite form. Red- and Blue-Striped Basculin generally start fighting each other on sight for territory. However, on rare occasions, one form may swim with the other's school. When a school of Basculin appears in a lake, Pokémon other than Corphish and Crawdaunt flee. Basculin has often been referred to as "the thug of the lake". Basculin uses its jaws to devour everything in its way. However, despite their fierce reputation, they become prey to stronger organisms. Basculin are also consumed by humans and considered very delicious. The Blue-Striped Form is a common food source with an inoffensive, light flavor. The Red-Striped Form was often placed on dinner plates in the past, and it is more popular with the youth. The meat of the Red-Striped Form is said to be fatty. Basculin is a popular Pokémon that anglers enjoy fighting while fishing, and they often release it back into the lake illegally due to how abundant the Basculin are. It competes with Carvanha for food.