Put 3 damage counters on your opponent's Benched Pokémon in any way you like.

If your opponent's Active Pokémon has exactly 4 damage counters on it, that Pokémon is Knocked Out. (You can't use more than 1 VSTAR Power in a game.)

VSTAR rule: When your Pokémon VSTAR is Knocked Out, your opponent takes 2 Prize cards.