Mew

Psychic 40 HP Stage: Basic Promo

Psyshock

Flip a coin. If heads, the Defending Pokémon is now Confused.

Pokémon Power Neutral Shield

Prevent all effects of attacks, including damage, done to Mew by Evolved Pokémon. You can't use this power if Mew is Asleep, Confused, or Paralyzed.

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