use your explorer kit then click on the screen then some shiny dots may come in sight go to them and dig in them and it may come skull fossils
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Must trade Cranidos appears in Diamond/Platinum (odd ID number) - Revive Skull Fossil
Shieldon.
You cannot get a Skull Fossil (Cranidos) in Pokemon HeartGold.
You revive it from a Skull Fossil, like in Diamond and Platinum.
Search for them in the walls underground.