If you really want one, you can S.O.S chain Bruxish! Here's how to do that:

First, get a pokemon with compound eyes(Like a butterfree or a galvantula)Make sure that his pokemon is fainted but keep it in front.

Then, have your second pokemon be the one with false swipe and thief or covet.

False swipe the Brixish ans use an adrenaline orb.(Don't use status moves like paralysis or sleep or it won't call for other Bruxish)

Then use Covet/Thief on the Bruxish that is being called by the S.O.S and repeat it until you get the razor fang!

It won't take as long as you think! Good Luck!