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Cover Fossil
From Bulbapedia, the community-driven Pokémon encyclopedia.
The Shell Fossil and Wing Fossil are fossils from the Generation V, Pokémon Black and White.
The fossils are found in the Ancient Castle, where they are given by a Backpacker. One can be chosen, and the other is kept by the Backpacker.
The Shell fossil can be regenerated into Purotoga and the Wing Fossil can be regenerated into Aaken.
The fossils can be revived by being given by the scientist who is in Isshu.