Is there an order to Oranguru's "Primate Wisdom" Ability? For example, can a player look at the top card before picking a card from their hand to put on the top of your deck? Or do they have to pick the card from their hand first?
The text of Primate Wisdom says to switch the card. This happens at the same time, so no you do not get to look at the top card of your deck first.
Source: TPCi Rules Team (2020-02-27)
Can you use Naganadel & Guzzlord GX's "Violent Appetite" Ability to discard a Pokemon if Naganadel & Guzzlord GX is not damaged?
Yes, you can. The main effect of this Ability is to discard a Pokemon from your hand.
Source: TPCi Rules Team (2020-02-27)
If I use Phione's "Whirlpool Suction" Ability and target my opponent's Pokemon with Stealthy Hood attached I know the Pokemon with Stealthy Hood does not move. But would I be able to discard all cards attached to Phione and put it on the bottom of my deck?
No. Since Stealthy Hood blocks the move effect of Whirlpool Suction, the "if you do" clause fails and Phione stays in play.
Source: TPCi Rules Team (2020-02-13)
Can I use Cinccino's "Make Do" Ability if there are no cards in my deck, just to discard a card?
No, you can't use Make Do if there aren't any cards left in your deck.
Source: Sword & Shield FAQ (2020-01-24), TPCi Rules Team (2020-02-06)
Can I use Cinccino's "Make Do" Ability to discard a card, then do other game actions such as play a Cynthia, and then finally draw the two cards later in my turn?
That's not how it works. You have to perform all of the actions of the Ability before moving on to other game actions.
Source: Sword & Shield FAQ (2020-01-24), TPCi Rules Team (2020-02-06)
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)