For Cinccino's "Make Do" Ability, can I use it when I'm discarding a card as part of some action or effect?
No. Discarding a card from your hand is part of the cost of using the Ability. You can't use a discard done from some other effect or game action.
Source: Sword & Shield FAQ (2020-01-24), TPCi Rules Team (2020-02-06)
Say Sky Field is in play and I have 8 Benched Pokemon, then I use Marshadow's "Resetting Hole" Ability. Do I discard Marshadow first and then discard down to 5 Benched Pokemon for the removal of Sky Field, or do I discard down to 5 Benched Pokemon first and then discard Marshadow?
The player who owns Marshadow can choose the order of discarding Benched Pokemon, either before or after the removal of Sky Field.
Source: TPCi Rules Team (2020-02-06)
If I use Rare Candy to play Galarian Obstagoon, can I use its "Untamed Shout" Ability to place 3 damage counters on my opponent's Pokemon?
Yes, because it is still being played from your hand.
Source: Sword & Shield FAQ (2020-01-24), TPCi Rules Team (2020-02-06)
Say my opponent uses Trevenant & Dusknoir GX's "Pale Moon GX" attack on my Keldeo GX with "Pure Heart" while Power Plant stadium is in play. If I replace the Power Plant with another stadium during my next turn, does Keldeo GX get knocked out at the end of the turn or not?
If Keldeo GX remains the Active Pokemon it will be Knocked Out. Keldeo GX's Pure Heart Ability *prevents* effects, but it does not *remove* existing effects. If an attack like Pale Moon GX places an effect directly on Keldeo GX, that effect cannot be removed by reactivating Pure Heart; in other words, effects that are removed when returning to the Bench can't be removed by Pure Heart.
Source: TPCi Rules Team (2020-01-09), TPCi Rules Team (2020-02-06)
Say I have Keldeo GX already in play, and my opponent uses Latios GX's "Clear Vision GX" attack with Power Plant in play. If I play a different Stadium to get rid of Power Plant, can I use Keldeo-GX's "Resolute Blade GX" attack now?
Yes, you can. When Power Plant is removed Keldeo GX's Pure Heart Ability turns back on, and Keldeo GX is no longer hit by the global effect of Clear Vision GX. If an attack does not place an effect on Keldeo GX directly, like an attack that puts an effect that isn't removed when returning to the Bench, it can be removed by reactivating Pure Heart.
Source: TPCi Rules Team (2020-02-06)
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)