You can't have more than 1 ACE SPEC card in your deck.
In order to play this card, you can't have any Basic Pokémon cards in your hand. Show your hand to your opponent, then search your deck for a Basic Pokémon card, show it to your opponent, and put it into your hand. Shuffle your deck afterward.
At the beginning of your turn, flip a coin. If heads, you can do nothing during your turn. If tails, your opponent can do nothing during his or her next turn.