Look at the top 3 cards from your deck. Choose 1 card from those cards, show it to your opponent, then put it into your hand. Shuffle the rest into your deck.

Discard 1 Energy card attached to Shining Mew in order to flip a coin. If heads, the Defending Pokémon is now Confused. If tails, the Defending Pokémon is now Asleep. If you can't discard Energy cards, this attack does nothing (not even damage).