You can get it by wild Pokemon such as seahorse (not always) and any other dragon type Pokemon.
gyados
Trade it from fire red/leaf green.
There's only one way to get the dragon fang. You can get one by battling dragon tamer Nicolas in the Meteor Falls for at least the 5th time. Use Trick, Covet or thief on one of his Pokemon, I think it's Shelgon, but I'm not sure yet. A wild Bagon doesn't hold a dragon fang, only a dragon scale (5% chance).
Nobody evolves from a dragon fang. Th Dragon Fang is used to power up the power of dragon type moves.
Ye sbut you must beat the Elite four and be able to go to the Battle Frontier.
There is no razor fang in emerald as Gliscor does not exist in the third generation.
No Pokemon actually evolves with a dragon fang. A dragon fang just raises the power of dragon-type moves.
Dragon fang
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There is no way to get a razor fang in Pokémon Emerald. It is only available in Pearl and Diamond.
You can't get a Razor Fang in Pokémon Emerald because it didn't exist in Emerald.
A Dragon Fang is not an item that makes Pokemon evolve. It just raises Dragon-type moves.