For Chandelure's "Shady Move" Ability, am I allowed to move a damage counter from one of my Pokemon to one of my opponent's Pokemon?
Yes, you can.
Source: Guardians Rising FAQ (2017-04-22), TPCi Rules Team (2017-05-04)
If I have more than one Dhelmise in play, do I get to add 10 damage for Metal Pokemon attacks for each one of their "Steelworker" Abilities?
Yes, they will stack.
Source: Guardians Rising FAQ (2017-04-22), TPCi Rules Team (2017-05-04)
Yveltal with "Fright Night" Ability knocks out Wobbuffet with the "Bide Barricade" Ability which was turning "Fright Night" off. Does Exp. Share on the Benched Pokemon behind Wobbuffet work?
Yes, since Wobbuffet was not yet in the Discard Pile, Fright Night remains off and Exp. Share works.
Source: TPCi Rules Team (2017-04-20)
If I play Captivating Poke Puff and find a Pokemon with the Omega Barrier Ancient Trait in my opponent's hand, can I choose that Pokemon to be benched or does Omega Barrier block the Captivating Poke Puff?
Yes, you can put that Pokemon onto the Bench. Ancient Traits are only active when that Pokemon is in play.
Source: TPCi Rules Team (2017-03-30)
Can I play Target Whistle and choose a Basic Pokemon in the Discard Pile with the Omega Barrier Ancient Trait, or does Omega Barrier block the Target Whistle?
Yes, you can put that Pokemon from the Discard Pile onto the Bench. Ancient Traits are only active when that Pokemon is in play.
Source: TPCi Rules Team (2017-03-30)
If Magearna EX with the "Mystic Heart" Ability is in play, are all Pokemon with Metal Energy attached protected from Greninja's "Shadow Stitching" attack?
If Magearna EX has a Metal Energy attached to it, all Pokemon with Metal Energy attached are protected; however, if Magearna EX does not have a Metal Energy attached to it, its Mystic Heart Ability is shut off and no Pokemon with Metal Energy attached are protected.
Source: TPCi Rules Team (2017-02-02)
When you use Tsareena's "Queenly Majesty" Ability, when the opponent reveals their hand do you get to choose which card to discard or is it random?
You get to choose.
Source: Sun & Moon FAQ (2017-02-02), TPCi Rules Team (2017-02-02)
If I have multiple Gumshoos GX in play, can I use each of their "Search the Premises" Abilities or am I limited to only one total per turn?
Each Gumshoos GX can use its own ability once per turn. So if you have two of them you can use the first Search the Premises to have your opponent reveal their hand, then use a Trainer card such as N to have the opponent shuffle their hand into their deck and draw new cards, and then use the second Search the Premises to have your opponent reveal their hand again.
Source: Sun & Moon FAQ (2017-02-02), TPCi Rules Team (2017-02-02)
Due to an error in the card text for Electrode's "Buzzap Thunder" Ability, the text on this card will be changed. The original text for this Ability says, "Once during your turn (before your attack), you may Knock Out this Pokémon and attach it to one of your Lightning-type Pokémon as a Special Energy card. This card provides 2 Lightning Energy only while this card is attached to a Lightning-type Pokémon." The original intention of this Ability was for Electrode to provide 2 Lightning Energy as long as it's attached to any Pokémon, not just a Lightning-type Pokémon. The new text will say, "Once during your turn (before your attack), you may Knock Out this Pokémon and attach it to one of your Lightning-type Pokémon as a Special Energy card. This card provides 2 Lightning Energy only while this card is attached to a Pokémon." Effective immediately, Electrode's Buzzap Thunder Ability will use this updated text instead of the original text.
Source: Organized Play News (2017-01-19)