If given to the Devon researcher in the Devon corporation the claw fossil can be revived into Anorith.
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To get a Lileep in Pokemon Ruby, Sapphire and Emerald you need to revive a Root Fossil. The Root Fossil can be found on Route 111 however choosing it will cost you the ability to get the Claw Fossil. Alternatively you can trade for a Lileep from another game if you've picked the Claw Fossil.
Anorith
The Claw fossil is a fossil which contains a Pokemon named Anorith, for you to get Anorith is to take the fossil and give it to a scientist in Devon Corp. (Rustboro City). After some time he will call you and tell you to come for the Pokemon (Anorith).
You get it by getting a life...and not playing Pokemon...
there are different Pokemon in it