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)
If I have Florges with "Calming Aroma" in play my attacks cost one Fairy Energy less. So I think I can use Zygarde's "Core Enforcer" attack without a Fairy energy attached, but what about the part of the attack that says to discard one Dark and one Fairy energy from this Pokemon?
You do as much of the attack text as you can, which in your situation means simply discarding one Dark energy.
Source: TPCi Rules Team (2017-09-21)
Weavile's "Rule of Evil" attack does damage to each Pokemon that has an Ability. But if Garbodor's "Garbotoxin" Ability is activated would "Rule of Evil" only damage Garbodor?
That's right, because Garbotoxin says each Pokemon (except those with Garbotoxin) have no Abilities.
Source: TPCi Rules Team (2017-09-14)
Can I use Heavy Ball to search for Wimpod that has the "Wimp Out" Ability on my first turn?
Yes, you can. Abilities only work when in play (unless the card says otherwise), so Wimp Out is not active while Wimpod is still in the deck.
Source: TPCi Rules Team (2017-09-14)
If I use Darkrai GX's "Restoration" Ability and then somehow it gets back into the Discard Pile (e.g. Parallel City, followed by Field Blower), could I use "Restoration" again to retrieve it from the Discard Pile?
Yes, whenever Darkrai GX is in the Discard Pile, you may use Restoration during your turn as long as its Ability has not been disabled.
Source: TPCi Rules Team (2017-08-31)
If my opponent used Turtonator GX's "Shell Trap" attack and I have Magearna EX with the "Mystic Heart" Ability in play, will my Pokemon with Metal energy attached get the 8 damage counters from "Shell Trap" if I attack and do damage to Turtonator GX?
No, it will not receive the 8 damage counters. Mystic Heart prevents all effects of your opponent's attacks, and Shell Trap's damage counters are an effect of your opponent's attack.
Source: TPCi Rules Team (2017-08-03)
Does Seviper's "More Poison" Ability stack with the effect of Toxapex GX's "Super Intense Poison" attack?
Yes, you first put 10 damage counters for the Super Intense Poison attack and then you get to add 1 damage counter for each More Poison ability.
Source: TPCi Rules Team (2017-08-03)
Does Seviper's "More Poison" Ability stack if I have more than one of them in play?
Yes, each of your Pokemon with a "More Poison" ability will add an additional damage counter to your opponent's Poisoned Pokemon in between turns.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I have Darkrai-GX in my discard pile but no Darkness Energy, can I use its "Restoration" Ability?
Yes, Restoration only requires that Darkrai-GX is in the discard pile (and that you have space on your Bench for it).
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If my Active Pokemon evolves into Lucario and uses its "Stance" Ability, does its effect get cleared if it moves to the Bench?
No, its effect remains.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)