Anorith, a Rock/Bug type.
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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.
A scientist on the second floor in the Devon building in Rustboro. He'll ask you if you want to revive it when you talk to him.
Anorith
If given to the Devon researcher in the Devon corporation the claw fossil can be revived into 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).