I suggest not to use cheat codes because it could jacked up you game. I put a cheat code in for aster balls and it worked but then the next time I played I went to battle mew two and I literally died in the game.
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cheat code to get infinite master balls fire red gameboy advance
There is none you can use an action replay
Its simple you cant you have to have game shark.
The master ball code is: 82003884 0001
Buy ultra balls in Fuchsia city or Indigo Plateau.