If I have two Toxicroak in play with the "More Poison" Ability, will my opponent put 4 more damage counters on their Poisoned Pokemon?
Yes, because the Ability says to "put 2 more" and not "instead of".
Source: Sword & Shield FAQ (2020-01-24), TPCi Rules Team (2020-02-06)
What happens if I put a Keldeo GX with "Pure Heart" Ability into play after my opponent has used Latios GX's "Clear Vision GX" attack? Would my Keldeo GX be able to use its "Resolute Blade GX" attack or not?
As long as the Pure Heart ability is not blocked or turned off when Keldeo GX comes into play, it would be unaffected by Clear Vision GX.
Source: TPCi Rules Team (2019-12-05)
When I use Roxie to discard two Pokemon that each have the "Blow-Away Bomb" Ability, do those abilities stack so I can place two damage counters on each of my opponent's Pokemon?
Yes, each of the Pokemon gets to use their own "Blow-Away Bomb" Ability when discarded by Roxie.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
If my Lillie's Poke Doll was Knocked Out by my opponent, can I use Oricorio GX's "Dance of Tribute" Ability?
Yes, even though they didn't take a prize, Lillie's Poke Doll was still considered a Knock Out of one of your Pokemon.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
With Florges' "Flower Picking" Ability, can I use it when my opponent only has one card in their hand? Or can I use it to shuffle in only one card instead of two if my opponent has two or more cards?
If the opponent only has one card in their hand you do as much as you can, so they reveal & shuffle in the one card. But if your opponent has two or more cards in their hand you must choose two of them, not just one.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
For Wishiwashi's "Scatter" Ability, when does this check for damage counters happen, before "in between turns" when Poison counters are placed or afterward?
After your opponent concludes their end of turn actions including all effects of attack and cleaning up any KO, then before in between turns you check for any damage counters on Wishiwashi that would trigger Scatter to shuffle Wishiwashi and all cards attached into your deck.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Using Lanturn's "Blinking Lights" Ability, may I repeatedly look at the top card of my opponent's deck, even if the deck has not changed?
Yes, as long as it does not waste time or interfere with your opponent's play.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
If my opponent has used Latios GX's "Clear Vision GX" attack, would my Keldeo GX be able to use its "Resolute Blade GX" attack?
Yes. The effect of Clear Vision GX is placed on each of the opponent's Pokemon, and since Keldeo GX's Pure Heart Ability prevents all effects of attacks done to it by your opponent's Pokemon GX, it is unaffected by Clear Vision GX.
Source: TPCi Rules Team (2019-09-05)
Can you use Greninja GX's "Elusive Master" Ability while Power Plant is in play?
Yes, you can. You get to put Greninja GX onto your bench AND draw three cards because Elusive Master activates while it is in your hand before it comes into play, and therefore is not blocked by Power Plant.
Source: TPCi Rules Team (2019-08-22)
Can you use the "Dedechange" Ability when you play Dedenne GX from your hand while Power Plant is in play?
No, you cannot. Dedechange does not activate until Dedenne GX is on the Bench, at which time it is considered "in play" and therefore blocked by Power Plant.
Source: TPCi Rules Team (2019-08-22)