i have tried multiple mobile versions of Pokemon and as far as i can tell no cloning will work therefore there is no way to duplicate anything as you normally have to put the masterball (or other item) on a Pokemon then clone. so without cloning there is no duplicating.
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You cannot duplicate master balls. You only get one handed to you. That is all you will receive.
You can't have unlimited master balls although u can give the master ball to a Pokemon and duplicate it at battle frontier
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)
you cant get infinate master balls but you can dupicate them and dont tell me how to duplicate i cant be stuffed to speak go through the game with out your master ball or trade one and after you beat the elet four go to the battle frontier and go to the battle town then use the cloning glitch.
go to the Pokemon center (sunyshore city) go on the PC and click someones PC while pressing L and R button.