X - x's physiological structure seems to enable it to create come kind of purple fog or haze when it appears in battle.
X - x 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. Its habitat is confirmed to exist in any location where a trainer in the Red/Blue/Yellow versions can be escaped from before being seen (see [[Mew glitch]]). Theoretically, it could also exist in some [[Glitch City]]-like location.