you can use the explorer kit and go down and dig into walls and you will eventually find a fossil
The Fossils in Pokémon Diamond are the Helix Fossil which is the Omanyte Fossil, the Dome Fossil which is the Kabuto Fossil, the Old Amber which is the Aerodactyl Fossil, the Root Fossil which is the Lileep Fossil, the Claw Fossil which is the Anorith Fossil, the Skull Fossil which is the Cranidos Fossil and the Armor Fossil which is the Shieldon Fossil.
You get the fossil in pearl and trade it to diamond
Its a sheildon fossil
No
The skull fossil is exclusive to diamond, so get a friend with pkmn diamond to ressurect the fossil and trade you a cranidos. As far as I know, this is the only way.
skull fossil and amour fossil
No
Yes the fossil is the skull fossil.
diamond- skull fossil- cranidos-rampardos pearl-armor fossil- sheldon-bastiodon
Shieldon (Armor Fossil) are only available to Pearl, similar to how you can get Cranidos (Skull Fossil) in Diamond but not in Pearl. In Diamond, you can get a Shieldon by trading with a friend who has one in Pearl.
there arent any
you have to mine it out