Omastar has a heavy, pale yellow, helix shell dotted with spikes. It has a sky blue body with ten tentacles, four of which are longer than the other six. Omastar has a squid-like beak and eyes with vertical-line pupils.
Most of Omastar's abilities are the same as Omanyte's, only stronger. Omastar can now learn how to use Stone Edge. Like most fully-evolved Pokémon, it can learn Hyper Beam and Giga Impact.
Omastar, unlike Kabutops, is far more defensive. While Kabutops prefers to slice prey apart or swim after them, Omastar does not. Omastar has a high Special Attack suggesting that it prefers waiting for prey to come near it so it can attack. It is not as fierce as Kabutops and probably does not move as much either, preferring to stay rooted to a spot, waiting.
The exact habitat of Omastar is unknown, but so far Helix Fossils are only found in the Kanto region.
Pokédex information indicates that Omastar would eat Shellder in the wild by cracking open their shells with sharp fangs and sucking out the insides.
This Pokémon was unavailable prior to Generation I.