Underground if you're very lucky...
To get the claw fossil you must dig under ground.
Try Mining underground, you can obtain the explorers kit in Eterna. Otherwise you cannot get a claw fossil in Diamond, Pearl or Platinum
The Claw Fossil is Anorith.
in diamond pearl and platinum go to the mining mueseun in oreburgh city and talk to the guy at the counter
Claw Fossil - Anorith Root Fossil - Lileep
You'll get an Anorith. CLAW fossil- anorith root fossil-lileep helix fossil- kabuto
You can find the Claw and Root fossil on Route 111, but you can choose only one.
One of them is Cranidos and it is a skull fossil. Another is Aerodactyl and you need an old amber fossil. There is also Kabuto in a dome fossil and Omanyte in a Helix fossil and Lileep in a Root Fossil.And last would be Anorith in a claw fossil and shieldon in a armor fossil.
the claw fossil is better superkidra- more specifically 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).
The dome fossil is only in firered and leafgreen, you can get the claw fossil or some other fossil, the claw fossil is anorith the other one is lileep.
The Claw fossil
ITs the fossil of a pokemon, namely kabuto