go to silths co battle your rivel then battle team rocket's boss talk to the guy on the couch [prasident] and he will give you a masterball.[becareful you can only do once every file[once every time you restart]].
go to Sliph Co and meet the president he will give it to you.note: you have to beat team rocket first.
After you defeat Giovanni in Sliph Co. the President will give you the MASTER BALL.
While you're exploring Sliph Co, there should be one that the president is holding it. defeat Givoanni and then talk to the president he'll give you a master ball. This is the only Master Ball that is obtainable in the How_do_you_get_master_balls_in_leaf_greenwithout using cheats.
defeat all the rockets in sliph co. (saffron city) and free the sliph co. pres. and he will give it to you
Defeat Giovanni In The Sliph Co. And It Is Gonna Be Unlocked.
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.
In Silph Co. in Saffron city. After you get to the top of the building.
You can only receive one master ball in leafgreen version its obtained from the president of Silph co after defeating team rocket and there boss.
You get it form the owner of the Silph Co building after you save him.
You receive the master ball in leafgreen after you stop team rocket in silph co. In saffron city as a reward from the president of silph
you get it in silph co which is in saffron city. after the boss fight, the leader of silph co gives you one.
After defeating Giovanni at his Rocket Headquarters in Celadon City he should give it to you.