Play Claw Fossil as if it were a Basic Pokémon. While in play, Claw Fossil counts as a   Colorless Pokémon (as well as a  Trainer card). Claw Fossil has no attacks of its own, can’t retreat, and can’t be affected by any  Special Conditions. If Claw Fossil is Knocked Out, it doesn’t count as a Knocked Out Pokémon.  (Discard it anyway.) At any time during your turn before your attack, you may discard Claw Fossil  from play.

Jagged Stone:

If Claw Fossil is your Active Pokémon and is damaged by an opponent’s attack (even if Claw Fossil is Knocked Out), put 1 damage counter on the Attacking Pokémon.