In X and Y, The Fossils can be revived in the Fossil Lab in Ambrette Town. !!
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That's easy, it's the Skull Fossil, which then seems to evolve into Cranidos. Which is 10x better than Shieldon. (STATS)
No you have to get the armor fossil and revive it then evolve it to a kabutops
(KANTO,JOHTO & HOEEN)kabuto, omanyte, arnorith and lileep evolve at level 40 (SINNOH)shieldon and cranidos evolve at level 30 (UNOVA)tirtouga and archen evolve at level 37
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
take it to the pewter museum and talk to the guy with the black hair he will take your fossil and make it into an omanyte