Omstar

オムスター

Omastar is a cephalopod mollusk Pokémon resembling an ammonite or nautilus. Its sky-blue body features several tentacles; those at the front are shorter and thicker than the ones at the rear. A pale yellow, helix-spiraled shell sits on its back. Several sharp spikes run along the shell's midsection, from the front to about halfway down its back. The shell's rim has two circular indents where Omastar's eyes are visible. Its eyes have yellow sclerae and vertically slit pupils. It has an oval mouth with a four-sectioned, fang-like beak.
It is believed that Omastar's extinction resulted from the increasingly heavy weight of its shell, which hindered its mobility, including its ability to hunt. Omastar swam the seas in search of prey, including prehistoric Shellder. It attacks only when prey comes near its tentacles. Omastar uses its tentacles to ensnare its prey before biting down with the deadly force of its beak. Its fangs are powerful enough to crush through rocks. With the shell broken, it would suck out the contents. Omastar was in turn preyed upon by Carracosta. Omastar is thought to be a distant ancestor to Octillery.
Evolution
Omastar evolves from Omanyte.