.G'Mp is a Glitch Pokémon which can only be found using GameShark or a similar cheating device and cannot be captured using any in-game methods. It is sometimes seen the parties of Glitch trainers.
.G'Mp has no specific habitat because it was never programmed to be in a specific area, nor was it ever programmed for the player to find it. Since it only exists in Generation I, it must exist in the Kanto region. It has no habitat relating to the Mew glitch. Theoretically, it could also exist in some Glitch City-like location.
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This Pokémon was unavailable prior to Generation I.