Gastly is a black, spherical Pokémon surrounded by a purple gas. It has a wide, pink mouth with two visible fangs. Though its eyes seem to extend past its round body, they are surrounded by visible eyelids. The gaseous aura surrounding the main body is highly toxic. As ninety-five percent of its body is composed of gasses, Gastly will dwindle away when exposed to strong winds.
Counter Shield: Gastly learned the Counter Shield method in its debut episode of Ghostly Gastly!, where it uses Psychic to control either Will-O-Wisp or Hypnosis, which it can then use in a unique fashion.