If you mean trading Pokemon from the 2nd gen (G/C/S) to the 3rd (R/S/E/FR/LG) then I'm sorry to inform you that its impossible. Hopefully you can find a different plan.
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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.
It is not possible to get a ninth badge in Pokemon FireRed. You can only get eight badges in Pokemon FireRed.