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.
Nuzzle
Flip a coin. If heads, your opponent's Active Pokémon is now Paralyzed.
Quick Attack
Flip a coin. If heads, this attack does 10 more damage.