Omastar is a sky-blue ammonite Pokémon, with several tentacles and a pale yellow, helix spiraled shell on its back. Several sharp spikes line the shell's midsection, spanning from its forefront to just a little towards its back. The shell's hem has two circular indents where Omastar's eyes come out. Its eyes have yellow sclerae and vertically-slit pupils. It has an oval mouth with a four-way jawed, fang-like beak. Once caught, it never lets go of prey, immediately biting down on its victim with immense power.

It is believed that Omastar's extinction was a consequence of the increasingly heavy weight of its own shell that affected it mobility, including its hunting. Omastar swam the seas in search of prey, including prehistoric Shellder. Omastar's used it tentacles to ensnare its prey before biting down with the deadly force of its beak. With the shell broken, it would suck out the contents. Omastar is thought to be a distant ancestor to Octillery. Carracosta is a natural predator of Omastar.

Another: Marriland

Google Docs: https://docs.google.com/document/d/1ePSbT7GM7cdrbNthv21MV4mjoCX6x9rH2ChZbFeqN4U/edit