A Razor Fang is a held item that causes the holder's damaging attacks to have a 10% chance of causing the opponent to flinch. This effect does not stack with moves that already have a chance to flinch. It can be obtained as a tier 2 special drop. It can also be obtained as a drop from certain Pokémon.
A Razor Fang can also evolve Gligar into Gliscor if Gligar levels up at night while holding the Razor Fang. This will consume the Razor Fang.