There is none
you can use an action replay
Chat with our AI personalities
cheat code to get infinite master balls fire red gameboy advance
Infinite Master Balls is a cheat, your not supposed to have it, your only supposed to have 1 or 2, so, I guess there isn't a way.
CHEAT
You can't have unlimited master balls although u can give the master ball to a Pokemon and duplicate it at battle frontier
Buy a Action replay and stuff