Just posted today on the POP site:
This affects how ATM Ice interacts with the cards.Root Fossil (this also affects Claw Fossil and Mysterious Fossil):
While in play, Root Fossil counts as a {C} Pokémon (as well as a Trainer card). Root Fossil has no attacks of its own, can't retreat, and can't be affected by any Special Conditions. If Root 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 Root Fossil from play.
This is a change from it being triggered if anything about the attack caused a KO.Jumpluff Buffer Poke-Body (this also affects Skiploom and Hoppip)
If Jumpluff would be Knocked Out by damage from an opponent’s attack, flip a coin. If heads, Jumpluff is not Knocked Out and its remaining HP becomes 10 instead.