Pokémon Diamond and Pearl/Oreburgh City

Oreburgh City is a coal-mining city, home to the first Sinnoh region Gym Leader - Roark. It also houses the Oreburg Mining Museum which revives the fossils of ancient Pokémon, and the Oreburgh Mine

Missing Gym Leader
A kind resident of Oreburgh City will take you to the Gym as soon as you set foot in town. Your rival will be waiting at the Gym, and he will inform you that Roark has gone into the Oreburgh Mine. You will need to find him before you challenge the Gym.

Exploring the city
Oreburgh has a lot of information to learn/items to get and you should do this before heading into the mine.

Choose Your Trainer Identity
A person on the ground floor of the Pokémon Center will ask you what kind of trainer you would like to be, giving you four options from a list of ten. If you choose one of these options, other players will see you as this character when you visit a Union Room.

Learn About Wi-Fi
The basement floor of every Pokémon Center is devoted to the Wi-Fi Club, but this is the first one open for business. On your first visit, a clerk will give you the Pal Pad and teach you how to register friends. This device will let you link up with a certain player when you are both connected to Nintendo Wi-Fi at the same time.

In game trade
A woman on the ground floor of the building to the left of the Poké Mart wants to trade Pokémon. She wants a Machop in exchange for an Abra. If you are interested and didnt get an Abra on Route 203, Machop can be found just to the north of Oreburgh on Route 207.

Get a Free Heal Ball
A man on the second floor of the same building is interested in Zubat(Geodude in Platinum). He doesn't want to trade; just to see one. If you bring him a Zubat(Geodude in Platinum), he will thank you by rewarding you with a free Heal Ball.

Get a Free Dusk Ball
Visit the building in the top left corner of the city. There, a woman on the second floor will give you a Dusk Ball free of charge.

Get a Free Great Ball
Visit the house that is furthest east in the city, directly below the Museum. There, a boy on the second floor will give you a Great Ball.

Revive fossil Pokémon
If, in your wanderings throughout Sinnoh, you happen to find a Pokémon fossil, leave the fossil at the Mining Museum in the northeast corner of town to have the scientists there revive it.

Items

 * (Platinum only) Before you head into the Oreburgh Mine, there are four items on the left in and around the "slag heap": Dire Hit, Yellow Shard, Heart Scale, and Pearl.
 * Super Potion(DP only) - in the southeast corner given by a worker next a Machop
 * Stardust(DP only) - left corner of the big rock in the worker area

Coal Badge
After convincing Roark to return to the Gym, the building will open for battle. Players who chose Turtwig or Piplup will gain an easy victory, but players who chose Chimchar may want to catch a Machop on Route 207 and level it up a bit or evolve your Bidoof into Bibarel at level 15 and it will learn Water Gun before yoy challeng Roark. If you don't want to do either, evolve Chimchar into a Monferno, which is also a fighting type. There are two other Trainers in the Gym. They can be avoided if you want, but it's not recommended because accepting a battle is always good and after you defeat the Gym Leader, you can't battle them anymore so you will miss the opportunity to gain money and train your Pokémon.

Trainers

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Gym leader

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After receiving the Gym Badge, Poké Marts will start carrying more merchandise and you will gain the ability to use Rock Smash outside of battle.

Whats going on in Jubilife
When you beat Roark you will head back to Jubilife for a one time event there via Oreburgh Gate and Route 203. This event will introduce you to Team Galactic which is needed to beat the game.