Can I use Diancie's "Sparkling Wish" attack to evolve a Pokemon that I just put into play this turn?
Yes, you can do that.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I use Eelektrik's "Small Appetite" attack against a Pokemon with 90 HP but it has the "Bodybuilding Dumbbells" Pokemon Tool attached, do I do 50 damage or 0?
You do 0 damage. The HP from Bodybuilding Dumbbells counts toward the Pokemon's maximum HP, putting it out of range of the Small Appetite attack.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I move Wimpod to the Active position and then evolve it into Golisopod GX, would I get the bonus damage from "First Impression"?
No. Wimpod is not the same Pokemon as Golisopod GX.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I use Ho-Oh GX's "Eternal Flame GX" attack, can I place a Stage 2 Pokemon like Charizard GX from my discard pile directly onto my Bench?
Yes. The attack does not specify that the selected Pokemon have to be Basic Pokemon.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I use Palossand's "Dust Storm" attack against a Stage 2 Pokemon, do I discard the Basic and Stage 1 cards attached to the Stage 2 Pokemon?
No. The Basic and Stage 1 as well as the Sandygast are part of their respective Pokemon and are not discarded.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I use Araquanid's "Bubble Net" attack and my opponent switches in a new Active Pokemon, can they attach an Energy to it during their turn?
Yes they can. The effect was on that specific Defending Pokemon and was removed when it went to the Bench.
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)
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 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 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)