This form uses the sprite of the ghost found in the Pokémon Tower if the player does not have the Silph Scope. The types of this form are not defined; it will use the type of the Pokémon whose data was accessed last, just as it will share the leveling up learnset, base stats, and types of it.
This form appears through the old man glitch if y is the character in the third, fifth, or seventh slot of the player's chosen name.
This form also appears through the Mew glitch with a Special stat of 184.
This glitch Pokémon article is part of Project GlitchDex, a Bulbapedia project that aims to write comprehensive articles on glitches in the Pokémon games.