You can't have more than 1 Shining Mew in your deck
Look at the top 3 cards of your deck. Choose 1, show it to your opponent, and place it in your hand. Place the other two in your deck and shuffle your deck.
Discard 1 Energy card attached to Shining Mew and flip a coin. If heads, the Defending Pokémon is now Confused. If tails, the Defending Pokémon is now Asleep. If you can't discard any Energy, this attack does nothing.