Can I use Diancie's "Sparkling Wish" Attack to search your deck for an Evolution card even if you have no valid targets to evolve?
Yes, you can, but only because it is an attack. You do as much of the attack as you can, so you can search through your deck but nothing more.
Source: TPCi Rules Team (2017-08-31)
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 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)
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)
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)
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)
If I use Bruxish's "Synchronoise" attack against my opponent's dual type Pokemon like Volcanion EX, and there are other Volcanion EX on the Bench, do they take 40 damage or 20?
They take 20 damage.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If my opponent has no Benched Pokemon, can I still use Alolan Muk-GX's "Tri Hazard-GX" attack?
You can use it, but it won't have any effect, and it will count as having used your GX attack for the game.
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 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)