Gastly

Almost invisible, this gaseous Pokémon cloaks the target and puts it to sleep without notice.

Sleeping Gas: Flip a coin. If heads, the Defending Pokémon is now Asleep.

Destiny Bond: Discard 1 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.