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.
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there are different Pokemon in it
it is in the top right of the desert. you can choose between it and the claw fossil
As soon as you give it leave the whole building go back inside talk to the guy who took the fossil to receive your very own Lileep(root fossil) or Anorith(claw fossil).
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.
the quick claw is in the Pokemon trainers school talk to the theacher and also you can find them in wild sandrews (steal them by covet of thief) mmm nothing more