At what level does Omanyte evolve?

The Pokémon Omanyte evolves into Omastar at level 40. It can gain the experience to level up through battling, holding an Exp. Share item while in a battle party, or using Rare Candy items.

Omanyte cannot be caught in the wild. Depending on the version of the game, it can be obtained through trade, as part of time capsule or event, or by reviving a helix fossil at a specific location. A fossil is either chosen by or gifted to the player. Omanyte and its evolution Omastar can be bred and are part of the Water 1 and Water 3 egg groups.