No, you don't have to buy the fang.
After you have beaten the game on Pokemon Pearl:
The Razor Fang is located in the garden at Battle Park. It is on the lower left screen. There will be a black belt near the entrance. Go down from the black belt's location, turn left. You should be at a corner. It is there in the pokeball in the corner.
u can buy them with battle points
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You can buy it at the battle frontier using BP
i know gligar evolves with a razor fang but im not sure what other Pokemon evolve with a razor fang
You can get Razor Fang from Battle Frontier 48BP.
u have to buy it in the battle frontier shops
You'll need to buy it with BP at the Battle Frontier.
you can evolve gligar into gliscor by giving gligar a razor fang and levelling it up at night, you can buy the razor fang at the battle tower or you can find it somewhere outside the battle tower.
The only Pokemon that evolves with the Razor Fang is Gligar. Gligar will evolve into Gliscor if it is holding the Razor Fang and levels up during the night.
In order to get a razor claw you need to have Gilgar hold the razor fang at night and level up. You can find a razor fang on Route 214.
you cant get the razor fang in pokemon fre red version
There is no razor fang in emerald as Gliscor does not exist in the third generation.