In Pokemon sapphire how do you make a claw fossil turn into Pokemon?

You can't make a Claw Fossil turn into a Pokemon in Pokemon Sapphire.

Here's why:

* Claw Fossil evolves into Anorith in Pokemon Ruby, not Sapphire. The two games have different fossils that are exclusive to each version.

* Fossil revival is done by the Devon Corporation. They have a special machine in Slateport City that can revive fossils. In Pokemon Sapphire, you can revive the Skull Fossil and the Armor Fossil.

To get Anorith, you'd need to trade a Claw Fossil from Pokemon Ruby to your Sapphire game.

Let me know if you have any other questions about Pokemon Sapphire!