Omanyte is a small, sky-blue ammonite Pokémon. It has ten tentacles and a pale yellow, helix spiraled shell on its back. The shell's hem has two circular indents, from which Omanyte's large saucer-like eyes protrude.
Several gas-filled chambers exist within Omanyte's shell, which it uses to regulate its buoyancy within the water. By evacuating or filling the chambers, it rises and falls while twisting its tentacles to swim. Living on and swimming about the sea floor, it feeds on plankton. If attacked or endangered, it quickly withdraws into its hard shell. Omanyte is considered extinct, although it can be revived from Fossils. Its fossils have been excavated in areas that were once oceans long ago. It is also suspected to have been preyed on by Archeops, judging from its bite marks found on Helix fossils. Carracosta is a natural predator of Omanyte.
Major appearances
Two Omanyte debuted in Attack of the Prehistoric Pokémon, where Ash encountered them along with all of the other Generation I Fossil Pokémon. A dynamite blast woke up the Fossil Pokémon living deep beneath Grampa Canyon. They chased Ash and Team Rocket around until an Aerodactyl showed up and scared them off.
Multiple Omanyte and their evolved form, Omastar, appeared in Fossil Fools. They were discovered to be living in the Ruins of Alph and moved to a museum.
An Omanyte appeared in Dealing With Defensive Types! in the Canalave Gym. It caught Team Rocket trying to steal food from the Gym kitchen whilst Ash was having his Gym battle with Byron, and attacked them with Water Gun, sending them blasting off.
Minor appearances
An Omanyte appeared in The Ultimate Test.
An Omanyte appeared in the Japanese credits of Pikachu's Rescue Adventure.
An Omanyte appeared in a fantasy in A Ruin with a View.
An Omanyte was revived from a Fossil in A Gruff Act to Follow!. It reappeared in the next episode, where it was seen along with several other Pokémon within the habitat created for the revived Fossil Pokémon.
Three Omanyte appeared in Lucario and the Mystery of Mew as some of the Pokémon living in the Tree of Beginning. One also appeared in the opening sequence of the movie.
A Mirage Omanyte appeared in a flashback in The Mastermind of Mirage Pokémon.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP046
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Omanyte, Omastar, Kabuto, and Kabutops
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Ash's Pokédex
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Omanyte and Omastar, Kabuto and Kabutops. It is believed these Pokémon became extinct tens of thousands of years ago. The details of their behavior is shrouded in mystery. Though some have speculated that they may still exist, none of these Pokémon have ever been seen alive.
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Original series entries continue below.
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Episode
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Pokémon
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Source
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Entry
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EP163
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Omanyte
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Ash's Pokédex
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Omanyte, the Spiral Pokémon. Believed to have lived over 2 billion years ago, recent research indicates that it was able to control its buoyancy by storing and releasing air in its shell.
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