Dark, Ghost and Bug (such as Umbreon, Spiritomb, Shadow Ball, Silver Wind) are super effective Pokémon or Pokémon attacks against Mewtwo.
dragon and ice is most efective against dragon.
Ice, Dragon, and Fairy
Grass and Electric moves
Ghost and Dark attacks are super effective against Ghost type pokemon.
ghost
dragon and ice is most efective against dragon.
fire and fight
Ice, Dragon, and Fairy
Fire is super effective against grass, bug, ice, and steel.
Grass and Electric moves
Steel is super effective against rock type pokemon.
Fire, Bug, Ice, Poison, Flying
ground type Pokemon are super effective against poison type Pokemon.
Rock, electric and ice are super effective against flying type pokemon.
Dragon-type moves are super effective against Dragon-type Pokemon.
Ghost and Dark attacks are super effective against Ghost type pokemon.
Earth and water Pokemon are good against electric Pokemon.