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You probally want to use it on mewtwo because it is level 70
Save your MasterBall for the Ledgendary dog (Suicune, Entei or Raikou). Don't use it on Mewtwo because it is really easy to catch him with just ultra balls. Just make sure you save before you fight Mewtwo :)
Mewtwo I guess????
no- at least not to start the battle you should try to catch it with something else you should use master ball as a last resort
Your strongest pokemon and one the that has something to put it to sleep that's how I caught the three legendary birds and mewtwo is next. So long as you remember not to use you're masterball, it should be fine. save right before you attack though, or you may accidentally kill it.