Roark

Roark is a character found in the Nintendo DS video games Pokémon Diamond and Pearl and seemingly Pokémon Platinum. He is the first gym leader in the video games, and uses purely rock based Pokémon. In the series, he is Byron's son, who is also a gym leader found later in the video game.

Before battling Roark, the player must first find him within Oreburgh Mine where he is found at the very end of it. After talking with him, he'll head to the gym to await the battle with you. After defeating the leader's Geodude, Onix and Cranidos, the player will get the first of the game's badges and will then be able to use the move Rock Smash, which is required to progress through the game.

Later, when the protagonist is allowed to go underground, Roark will not only be there to greet the player, though he'll also explain the basics.