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.
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in the museum talk to the guy alone at the desk he will revive it
level 20, as with all fossils in all games
You could revive it at the oburgh museam
To revive a fossil, you'll have to take it to Devon Corporation, located in Rustboro City. Go to the second floor and speak to the scientist on the lower right corner.
Yes, you go to Nacrene City and go into the musuem. As you enter look at the right and talk to the guy behind the stand and you'll revive the Pokemon.