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ゴーストGōsutoGhost in original Japanese language versionsSpectre in the beta versions of Red/Blue}} takes the shape of an angular floating face with disembodied hands. It has a sinister look, complete with fangs and claws. However, when approached by people, it has a habit of reverting to a spherical form that obscures its eyes, mouth, and hands (as seen in Pokémon Snap). In this state, the attack Foresight can reveal it. Haunter is considered in the Pokédex to be a 'gas type' Pokémon, because of the overall structure of his body. Because of its ability to slip through block walls, Haunter is said to be from another dimension. They seem to eat by first paralyzing their opponent with Lick, then draining a bit of their life force, although it's possible they may eat other food as well, such things like Pokéblocks. It is also said to eat people's dreams by going inside them and scaring them to death.
In total darkness, where nothing is visible, it lurks, silently stalking its next victim. Its tongue is made of gas, yet by licking, it can sap its victim's life. It causes shaking that will not stop until the victim's demise. On rare occasions, after a windy night, a Haunter may be seen trapped in the day's shadows.