You may have up to 4 Basic Pokémon cards in your deck with Unown in their names
Once during your turn (before your attack), you may search your deck for another Unown and 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.
Choose 1 of the Defending Pokémon's attacks. That Pokémon can't use that attack during your opponent's next turn.