Going underground using the explorer kit that you get in Eterna city and mining.
mining
It is in Orebourgh City.
No, it doesn't.
Mining and digging Underground.
Any mineral deposit, from gold to platinum to coal
yes
The north-east corner of Orebrough City.
Get the Armor Fossil in the Underground, and have it restored at Oreburgh Mining Museum.
you can find it while mining underground.
No but I think there's one for the mining musuem
Which Pokemon do you want
Oreburgh mining museum (Oreburgh city)