it's in oreburgh city
After you beat the gym
IN oreburgh city
in Oreburgh city in the museum
Trade a Skull fossil across from Pokemon Diamond. Them take it to the museum.
Just go north of the Orebough Pokemon Center. -Empol
The Mining Museum is located in the top right corner of Oreburgh City.
A place you where give fossils for Pokemon like Cranidos for the skull fossil.
take it to oreburg and talk to the guy in the museum
You cannot unless you use cheats (Action Replay)
In Pokemon Diamond you can only get Diagla, and Cranidos Diagla you get at the Spear Pillar - goes with the story timeline! Cranidos is a fossil you get revived in the mining museum!
NO there is no fossil museum in hearthome city
In the Oreburghe mining museum at the top left corner of the city.