Dustin is the Gym Leader of Goldune City's Gym, known officially as the Goldune Gym. He specializes in Ground-type Pokémon. He gives the Grain Badge to trainers who defeat him. He is called the master of quicksand.
In the games
Dustin appears at first....
After this, He appears as the leader of Goldune City's Gym. This gym is the forth to be challenged by the player. Trainers who defeat Dustin will receive the Grain Badge, along with TM23 Quicksand.