Aggronite

==Information==
Location: Underground Railnet or Grand Hall Basement
Available: After Badge 14
==Guide==
Go to Grand Hall and cover the expense of the Railnet Reconstruction Project.
Then go down to the Grand Hall Basement and talk to the guy in the bottom left corner. He'll tell you about how he is having problems with the railnet under the Byxbysion Wasteland and will ask you to help.
Go to Byxbysion Wasteland and enter a hole in the wall at the top of the wasteland like in the left photo below. Go left up the stairs and go out.
Go towards the bottom left corner and enter the area like in the left photo below. Once inside, go downstairs and defeat the wild Pokemon. Approaching them two triggers a series of two battles with no healing in-between.
Pokemon Refugees is battled in a Cave in a Single Battle format.
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Pokemon Refugees is battled in a Cave in a Double Battle format.
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In the first battle, all of the Pokémon have Sturdy and Custap Berries, and their strategy is to collapse the field by using Earthquake twice. Since the Arons and Lairons have Sturdy, they can take a hit, then use their Custap Berry to immediately use Earthquake again, causing the ceiling to collapse and taking out your Pokémon.
To prevent this from happening, you can get a Pokemon with Protect and use it every other turn when the ceiling is about to collapse. Other ways to beat this include using a Pokemon with a multi-hit move, Substitute, or Mold Breaker, or by changing the field. 
The second battle is against two Aggron hordes as a double battle. The two leads will carry Rockium-Z and have a chance to use it on their Rock Slide in battle. The other Aggrons will be holding a Telluric Seed, which will improve their defenses as a result of the field they're on. An easy way to beat the Aggrons is to have a Pokemon that is faster than the Aggrons and can learn Surf so that the Aggrons die before they get to do anything. Since they don't have Sturdy, you don't have to worry about finishing them off.
After defeating them you can the Aggronite in at the end of the area. If you leave the area without collecting it, you can obtain it later by talking to the same guy in the Grand Hall Basement.