Razor Fang is a Generation 4 item, so it's not possible.
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you cant get the razor fang in pokemon fre red version
you find the razer fang in victory road actually.... you go to route 214. then you keep going down till you see the 2nd part of the tall grass. in the second part of the tall grass, in the bottom right hand corner there is a space. the razor fang is hidden right there.
mine learned it at lv.56
AnswerIn between the bushes before you arrive at battle tower.Actually you find it in the bottom left hand corner next to a statue
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.