Psywave

Does 10 damage times the number of Energy cards attached to the Defending Pokémon.

Devolution Beam

Choose an evolved Pokémon (your own or your opponent's). Return the highest Stage Evolution card on that Pokémon to its player's hand. That Pokémon is no longer Asleep, Confused, Paralyzed, or Poisoned, or anything else that might be the result of an attack (just as if you had evolved it).

So rare that it is still said to be a mirage by many experts. Only a few people have seen it worldwide.