If this Baby Pokémon is your Active Pokémon and your opponent tries to attack, your opponent flips a coin (before doing anything else required in order to use that attack). If tails, your opponent's turn ends without an attack.
Slippery Seal
Once during your turn (before your attack), you may switch your Active Pokémon with one of your Benched Pokémon. If you do so, your opponent must switch one of their Benched Pokémon for their Active Pokémon