If I used Poipole's "Knockout Reviver" attack, but then on my opponent's next turn they play Channeler, would that allow them to take a prize for KO'ing Poipole?
No, it would not. The effect of Knockout Reviver resides on Poipole, and the opponent's Channeler only clears effects on the opponent or their Pokemon.
Source: TPCi Rules Team (2019-08-22)
What happens if I use Steelix's "Gigaton Shake" attack, and then my opponent uses Mawile GX's "Captivating Wink" Ability during their turn? Would those Pokemon I put into play be able to attack on my next turn (since it was not during MY turn)?
No, they would not be able to attack.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
If I used Steelix's "Gigaton Shake" on my previous turn, would Channeler allow my Pokemon to attack this turn?
Yes, the effect of Gigaton Shake would be removed, and your Pokemon would be able to attack.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
If I use Naganadel GX's "Injection GX" attack during a Tiebreaker game, do I win?
Yes.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
When I use Naganadel GX's "Injection GX" attack, am I allowed to mix up my opponent's prize cards so they don't know which card I added to their prizes?
No, you may not. When Injection GX adds a card from the discard pile you must not disturb the placement of any prize cards the opponent still has in play.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
For Oranguru's "Sage's Riddle" attack, if I put down a Pokemon with more than one type does the opponent have to guess both of its types?
No, they only have to guess one of the Pokemon's types in order to get it right.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
When using Chandelure's "Spirit Burner" attack, can I place any discarded Stage 1 or Stage 2 Pokemon directly onto my bench?
Yes, you can. However, because of the order of this attack, you cannot put a Prism Star card onto your Bench.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
If I use Froslass' "Spiteful Sigh" attack to put enough damage counters on Froslass to leave less than 40 HP on it, will its attack be prevented if Blizzard Town is in play?
No, its remaining HP is checked for Blizzard Town before you place the damage counters onto Froslass.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
When using Froslass' "Spiteful Sigh" attack, can you put more damage counters on Froslass than it has remaining HP?
Yes, you can.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)
If my opponent has used Latios GX's "Clear Vision GX" attack, can I use a GX attack that ignores effects?
No, because you don't even get to start using the GX attack.
Source: Unified Minds FAQ (2019-07-19), TPCi Rules Team (2019-08-01)