Play Root Fossil as if it were a   Colorless Basic Pokémon. (Root Fossil counts as a Trainer card as well, but if Root  Fossil is Knocked Out, this counts as a Knocked Out Pokémon.) Root Fossil can’t be affected by any  Special Conditions and can’t retreat. At any time during your turn before your attack, you may  discard Root Fossil from play. (This doesn’t count as a Knocked Out Pokémon.)

Spongy Stone:

At any time between turns, remove 1 damage counter from Root Fossil.