you take it to oreburgh city and bring it to the mining museum if you are talking about Pokemon diamond or pearl.
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You cannot get a Skull Fossil in Soulsilver.
Take the fossil into the Oreburgh museum
Shieldon.
You cannot get a Skull Fossil (Cranidos) in Pokemon HeartGold.
You have 9 types: Armor Fossil, Claw Fossil, Cover Fossil, Dome Fossil, Helix Fossil, Old Amber, Plume Fossil, Root Fossil, Skull Fossil