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.
Thundershock
Flip a coin. If heads, the Defending Pokémon is now Paralyzed.
20
Slam
Flip 2 coins. This attack does 80 damage times the number of heads