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.
Naughty Kick
Once during your turn (before your attack), you may flip a coin and your turn ends. If heads, put 3 damage counters on 1 of your opponent's Pokémon