The museum in Oreburgh city has a guy behind the counter that will make you a Pokemon from a fossil.
you need to have the explore kit then you need to dig in the under ground.
Cranidos is a Rock type Pokemon that can be revived from a Skull Fossil in Pokemon Diamond. It will evolve into Rampardos at level 30.30
First you have to excavate a Skull Fossil in the Underground. Transfer the fossil to your bag, and take it to the mining museum in Oreburgh City. Talk to the man behind the counter, and he will turn the fossil into Cranidos.
the skull fossil
What's a skull fossil
Cranidos
Shieldon.
Defienetly the skull fossil
You cannot get Skull Fossil or Armor Fossil in Pokemon HeartGold.
You cannot get a Skull Fossil (Cranidos) in Pokemon HeartGold.
regirock
You cannot get Cranidos in Pokemon Pearl unless you trade to get the Skull Fossil from a friend. You can only find a Skull Fossil in Diamond.