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.
Search your deck for a card that evolves from 1 of your Pokémon and put it on that Pokémon. (This counts as evolving that Pokémon.) If you do, put 1 damage counter on Unown. Shuffle your deck afterward.