one
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You need to transfer from Emerald the mb. You give (Emerald) the Pokemon you are going to clone the master ball (hope you have 1) and then do the battle tower glitch and voila! Here are your master balls. You can use this as many times as you like!
INFINITY MASTERBALLS just do my trick Trade pokemon for pokemon holding masterballs take them away and trade for your pokemon back
There is only ONE I believe.
therer is one that you get in the team magma hideout but you can get more if you give it to a Pokemon to hold and clone it. THIS ONLY WORKS IN EMERALD IN THE BATTLE FRONTIER
You can get 2 Master Balls in both versions.
you can get 1 master ball
You can only get one or use cheat
i masterball
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You can clone a Pokemon with the master ball or trade it to a friend and keep starting over until you're satisfied with the number of master balls.
Attach your master ball to ONE POKEMON, next CLONE that Pokemon for how many master balls you want. Next detach them, and release all the clones (if you want)