after you defeat ash, it is found in Johto, there you can find it
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You could revive it at the oburgh museam
in the museum talk to the guy alone at the desk he will revive it
You can revive fossils in Pokémon White in the museum in Nacrene City. Once you have entered the museum, talk to the person in the blue hat on the right hand side.
The Pewter Museum.
Aerodactyl FOSSILS can be found in the ruins of alph, among other places. The fossil is called OLD AMBER to REVIVE the fossil, you have to beat the elite 4 and get to Pewter City in KANTO. Hope that helped!:)