Armor Fossil
The armor fossil is unique to "Pokemon: Pearl." Take the fossil to the Pokemon Museum in Oreburgh where the scientist will revive it, producing Shieldon, a rock/steel Pokemon.
Helix Fossil
This fossil is a rare find in the Sinnoh Underground. Dig it up and take it to the Oreburgh museum to revive an Omanyte Pokemon. Omanyte is a rock/water Pokemon. Both "Diamond" and "Pearl" versions of the game have this fossil.
Dome Fossil
Another fossil available in both "Pearl" and "Diamond," the dome fossil can be used to revive Kabuto, a rock/water Pokemon.
Root Fossil
This fossil can be dug up in either version of Pokemon. Take it to the scientist at the Oreburgh Museum to revive Lileep, a rock/grass Pokemon.
Claw Fossil
Dig a claw fossil out of the underground and you can have the Oreburgh Museum scientist revive an Anorith. Anorith is a rock/bug Pokemon. Both "Diamond" and "Pearl" versions of the game have this fossil.