there is only one master ball in leaf green, so should save it for mew and the 3 lgendary dogs
Have a friend trade you a Pokemon holding the master ball they received.
Master Ball
after you beat Giovanni the second time talk to the man on the couch and he will give you a master ball
use a master ball on it
Only one
No unless you have a game shark
u cant
There is only one
You should get the Master Ball by talking to the President of the Silph Co. in Safron City after you saved him by defeating Giovanni.
Try to get a ultra ball
You can't,you need emerald.
to catch suicune,mewtwo,raikou and entei