Urmmm... you can't get in fire red....... only in diamond, pearl and platinum.
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If your Infernape is not shiny to begin with, it will not evolve into a shiny Pokemon.
Infernape does not exist in Pokemon LeafGreen. Infernape didn't exist until Diamond/Pearl/Platinum, which was released after LeafGreen.
You cannot find an infernape in Pokemon emerald for that Pokemon you need Pokemon platinum, pearl or diamond.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
The only way to getting infernape is by link trade