Elekid

It rotates its arms to generate electricity, but it tires easily, so it charges up only a little bit.

Pokemon Power — Playful Punch: Once during your turn (before your attack), you may flip a coin. If heads, do 20 damage to your opponent's Active Pokémon. (Apply Weakness and Resistance.) Either way, this ends your turn. This power can't be used if Elekid is Asleep, Confused, or Paralyzed.