You can restore Fossils in Cinnabar Island.
There is a Pokemon laboratory, Go to the last room on the right, and talk to the Professor.
^^
Hope That Helps
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The Pewter Museum.
Fossils cannot be created in Pokemon FireRed, there is a finite number of them to find.
only if you trade with a friend
You can't, you have to trade over from FireRed or LeafGreen.
Aerodactyl is revived from one of the fossils that you receive in Mt. Moon.