For each Pokémon in play named Venomoth, Beautifly, Dustox, Mothim, Volcarona, or Vivillon any damage done to Butterfree is reduced by 10 (before applying Weakness and Resistance). Put 1 damage counter on each of those Pokémon. This power stops working if Butterfree is Asleep, Confused, or Paralyzed.
Flip a coin. If heads, the Defending Pokémon is now Asleep.