I think there is only one masterball in that game but ask someone more experient. The one i know is at Saffron in the big building after you beat the Team rocket leader you get it from the owner of that building
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cheat code to get infinite master balls fire red gameboy advance
There is none you can use an action replay
The master ball code is: 82003884 0001
Buy ultra balls in Fuchsia city or Indigo Plateau.
there isnt any dusk balls in fire red, they were introduced in generation iv