This item has different uses depending upon the game in which you are playing.
In Gold, Silver & Crystal, you can get this item numerous times and you can use it to heal a Pokémon by 20HP.
In HeartGold & SoulSilver, you get one of these items and can exchange it with a man in the Underground Route between Routes 5 & 6 for TM64 - Explosion.
In Black & White, the RageCandyBar can be used for one of two things. First, it's capable of healing all Status problems on a single Pokémon. Secondly, you can use them to awaken the Zen Mode Darmanitan in the Desert Resort
The Razor Fang is a type of held item. It allowsGligar to evolve into Gliscor. Grants certain moves used by the holder a 10% chance of causing targets to flinch. Each strike of a multi-strike move has an independent chance of causing the target to flinch.