only one on each GBA POKEMON game
you cant measure out ultra balls to equal master balls. master balls are just a lot better.
You can get 2 Master Balls in both versions.
1 Master Ball
Well you can get a action replay code and use it to get 999 Master Balls
you can get 1 master ball
2
1
1
i masterball
Just one
one
You cannot duplicate master balls.