Gastly

Gastly appeared in 1996 video game called Pokémon Red & Green. Gastly is a Gas Pokémon. Gastly likes to lurk in abandoned buildings, where its presence sometimes causes strange lights to flicker. This gaseous Pokémon is very to hard to see, but it gives off a surprisingly delicate, sweet scent.

Gastly has no true form, due to 95% of its body being poisonous gas. However, it consistently appears as a black, spherical Pokémon surrounded by a purple haze. It has a wide, pink mouth with two visible fangs. Though its eyes seem to extend past its round body, visible eyelids surround them. It produces a faint, sweet smell. The toxic gas surrounding the main body can induce fainting and suffocation, and it is capable of enshrouding an enemy of any size. Its gaseous form makes it one of the lightest Pokémon tying with Haunter, Flabébé, Cosmog, and Kartana.

The anime suggests that Gastly has a playful personality, often frightening and playing pranks on people for fun. However, it has shown a willingness to preserve or pass on the memories of departed humans. It has further been shown changing form and creating illusions, and it is capable of phasing through solid objects and forming tangible hands out of its gasses. Gastly can be found in caves, but the anime has shown it living in old, dilapidated buildings, as well. It will dwindle away when exposed to strong winds, so groups cluster under house eaves to escape the wind. It may also cause flickering lights in abandoned houses. In the past, Night Shade was its signature move.