Dustin

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 in Goldune Cave, where he have found a Teeth Fossil and a Plate Fossil.

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.

Pokémon Solar Light & Lunar Dark

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Rematch

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Goldune Cave
 Sorry! It wasn't at the Gym, but I couldn't resist the urge to uncover these Fossils! I tripped over a piece that was poking out of the ground and just had to dig them up! Awesome, right!? 

 Oh. Sorry. I guess we can go back, now... but the Fossils I don't want to just leave them! Do you know that you can get Pokémon from these Fossils? There's a building in Goldune City. A scientist named Burke can revive them using a special machine. You guys should take a Fossil each and get them revived!   Hey! You should choose a Fossil!   Do you want the Plate Fossil?   Do you want the Teeth Fossil?   Choose carefully!   I guess you really do want to battle. Okay! We'll go, now! ''
 * If the player tries to get away
 * If the player looks the Plate Fossil
 * If the player looks the Teeth Fossil
 * If the player answers "no"
 * After choosing the Fossil

Goldune Gym
 Oh. Hey, do I know you from somewhere else? Ah, yes! You're the Trainer from the cave! Welcome to my Gym! Glad you made it! So, you want to have a battle? You should know that I specialize in Ground-type Pokémon. They are powerful with high Attack and Defense stats but, normally, they are not the fastest ones. Let's do it ! I won't go easy!   I'm stuck in the quicksand...   That was awesome! I can tell you're gonna go far on your journey! You have earned this. Awesome, huh? Oh, and you get this. It's an attack that can trap foes in sand and hurt them every turn. Good luck with everything! Make sure your adventure is awesome! 
 * Before battle
 * Being defeated
 * After being defeated

Trivia

 * His name is a reference to Dust.