Sleeping Gas - Flip a coin. If heads, the Defending Pokémon is now Asleep. Destiny Bond - Discard 1 Psychic Energy card attached to Gastly in order to use this attack. If a Pokémon Knocks Out Gastly during your opponent's next turn, Knock Out that Pokémon. Almost invisible, this gaseous Pokémon cloaks the target and puts it to sleep without notice.