can u catch mewtwo without the masterball on pokemon leafgreen?

Answer 1

yes

you don't actually need the masterball in ANY of the games, but it certainly helps. the reason the masterball is a great prize is not because it's used to catch whichever legendary you choose, but because it can't fail.

you can catch mewtwo with any of the newer balls (love, time, nest, etc..) or you can use ultra balls. i'm sure pokeballs, great, and those white ones with the red line (you get from buying ten of something in a store) will NOT work.

i caught a caterpie with my masterball, so i didn't need to worry about possibly missing, since it was a sure shot