Once during your turn (before your attack), you may search you deck for another Unown and switch it with Unown. (Any cards attached to Unown, damage counters, Special Conditions, and effects on it are now on the new Pokémon.) If you do, put Unown on top of your deck. Shuffle your deck afterward. You can't use more than 1 Shuffle Poké-Power each turn.
Flip a coin. If heads, put damage counters on the Defending Pokémon until it is 10 HP away from being Knocked Out.