action replay is best
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You can't have unlimited master balls although u can give the master ball to a Pokemon and duplicate it at battle frontier
you get unlimited master balls by using action replay and put on master balls x999
Get rid of some of the master balls! the number of master balls you have is the number of the pokemon
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)
There's no such guy in Sandgem Town that has 3 Master Balls.