Gastly (Base Set 50/102)
Sleeping Gas

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

Psychic Colorless
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.