Gnawing Curse - Pokémon Rulings Compendium

If I use Baxcalibur's "Super Cold" Ability while my opponent has Gengar ex with "Gnawing Curse" in play, do I put 2 damage counters for each Energy card attached from "Super Cold"?: Yes, you do.

Source: Temporal Forces FAQ; TPCi Rules Team (2024-03-21)

If I use Metang's "Metal Maker" Ability while my opponent has Gengar ex with "Gnawing Curse" in play, do I put 2 damage counters for each Energy card attached from "Metal Maker"?: No, Metal Maker does not attach Energy cards from your hand so Gnawing Curse does not apply.

Source: Temporal Forces FAQ; TPCi Rules Team (2024-03-21)

What happens if I have Miltank with the "Moomoo Malt" Ability and my opponent has Gengar with the "Gnawing Curse" Ability in play? Which Ability goes first? Or does it even matter?: The player that owns the affected Pokemon gets to choose the order that the two simultaneous Abilities are applied. However, keep in mind that you cannot go below zero damage done; for example, if you have 50 damage and you use Moomoo Malt first, you can't "go negative" and then have Gnawing Curse's counters simply disappear. Also remember, if you choose Gnawing Curse first and the damage counters put the Pokemon over its maximum HP you still get to use Moomoo Malt before checking for KO's.

Source: TPCi Rules Team (2017-11-02)

If there are two Gengar in play with the "Gnawing Curse" Ability, how many damage counters would be applied if the opponent attached an energy card to one of their Pokemon?: They would place 4 damage counters on that Pokemon.

Source: Crimson Invasion FAQ (2017-10-20), TPCi Rules Team (2017-11-02)