In Pokémon Gold and Silver, the player must collect the Dragon Fang in Dragon's Den in order to receive the Rising Badge from Clair. If the Dragon Fang from Dragon's Den is not obtained, but the player has one anyways, usually from trading from another trainer, Clair will call the player a cheater and refuse to give the badge.
A Dragon Fang appeared in Beauty is Skin Deep as the treasure of Clair's family, kept in the Blackthorn Gym. It is the fang of an ancient Dragon Pokémon that terrorized Blackthorn City. The Dragon Fang is part of a ritual with the purpose of bringing peace to all Dragon-type Pokémon. The ritual involves the Blackthorn Gym Leader placing it on a special ceremonial table, then pouring water over it, causing a light dragon to burst out of it and rise into the sky. Legend says that this light dragon becomes a star and watches over all Dragon-type Pokémon.