if you go to the homeside ask.com and type: Pokemon FireRed version GameShark SP codes, and click on the first link there will be a mastercode and alot of other very nice cheats
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In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.