A clan of masters of Dragon-type Pokémon have lived in the city for generations. The masters built the Dragon's Den, a cavern with an underground lake that contains a shrine to Dragon Pokémon, as well as the elders of the Dragon clan. The entrance is located behind the Gym, across a small pond, while the main cavern seems to be located underneath the city itself.
The Blackthorn Gym is the official Gym of Blackthorn City. It specializes in Dragon-type Pokémon. The Gym Leader is Clair. Trainers who defeat her receive the Rising Badge.