Omanyte has a large, pale yellow shell on its back. Its main body is sky blue with ten tentacles, two of which are longer than the other eight. Omanyte has saucer-like eyes. It uses the many gas-filled chambers in its helix shell to remain buoyant in the water column. It regulates its buoyancy by evacuating gases from compartments. Its shell turns into the Fossil that is used to resurrect it.
Omanyte learns several Water-based moves and a small handful of Rock-type moves.
Omanyte swims by twisting its ten tentacles about. If attacked by an enemy, it withdraws itself inside its hard shell.
The exact habitat of Omanyte is unknown even though there have been records of Omanyte hiding deep in damp caves, but so far Helix Fossils are only found in the Kanto region.
Unlike its evolved form, Omastar, this Pokémon feeds on plankton in the wild.
This Pokémon was unavailable prior to Generation I.