Eevee

Its genetic code is irregular. It may mutate if it is exposed to radiation from elemental stones.

Tail Wag: Flip a coin. If heads, the Defending Pokémon can't attack Eevee during your opponent's next turn. (Benching either Pokémon ends this effect.)

Quick Attack (10+): Flip a coin. If heads, this attack does 10 damage plus 20 more damage; if tails, this attack does 10 damage.