If I have Eternatus VMAX with "Eternal Zone" Ability in play and my opponent uses Celebi's "Time Spiral" attack to devolve one of my benched Darkness type Pokemon to a non-Darkness type Pokemon with enough damage already on the devolved Pokemon to knock it out, is it KO'd before having to reduce my Bench down to 5 Pokemon, or if I discard it to reduce my bench is it not KO'd?
You would discard your Bench down to 5 first, then check for a KO. That means you could discard the newly devolved Pokemon to avoid a KO, even if Eternatus VMAX is the one being devolved!
Source: TPCi Rules Team (2020-08-13)
Can a dual-type Pokemon like Bisharp from Steam Siege (being both a Darkness type and Metal type) be played onto the bench while Eternatus VMAX's "Eternal Zone" ability is on?
Yes, as long as the Pokemon is Darkness type it can be played onto the bench.
Source: TPCi Rules Team (2020-08-13)
If I have an Eternatus VMAX with "Eternal Zone" Ability and less than 8 Pokemon (all Darkness type) on my bench, can I use Giratina's "Distortion Door" Ability to put it from the discard pile onto my bench and use its effect before it is discarded?
No, you cannot even put it onto your bench because it is a non-Darkness Pokemon.
Source: Darkness Ablaze FAQ (2020-07-31), TPCi Rules Team (2020-08-13)
If you have 2 Darkness Pokemon on the bench and an Eternatus VMAX with the "Eternal Zone" Ability, can you play a non-Darkness Pokemon onto your bench?
No, you cannot put any non-Darkness type Pokemon into play. This includes things that would put Darkness type Pokemon directly into play, not just playing them from your hand!
Source: Darkness Ablaze FAQ (2020-07-31), TPCi Rules Team (2020-08-13)
If you have 8 Darkness Pokemon on your bench including a Weavile, and you devolve it into a Water type Sneasel, can you discard just the Sneasel and stop, or do you have to continue discarding benched Pokemon down to 5?
Once you begin discarding Pokemon you must complete the full action of getting down to 5 benched Pokemon, even if you don't have any non-Darkness Pokemon on your bench any more.
Source: Darkness Ablaze FAQ (2020-07-31), TPCi Rules Team (2020-08-13)
When using Falinks V's "Iron Defense Formation" Ability or Falinks' "Team Attack" attack, do I get to count any Falinks V I have in play too?
Yes, because Falinks V has "Falinks" in its name.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)
Can I use Hatterene's "Mind Hat" Ability if I don't have any cards in my hand? Or if my opponent doesn't have any cards in their hand?
As long as either player has a card in their hand, you can use Mind Hat.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)
If I draw a Pokemon with the "Top Entry" Ability during my first turn of the game, can I put it onto my bench right away?
Sure, but remember you must do this BEFORE it gets into your hand.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)
If I have a Pokemon with the "Top Entry" Ability in my starting hand at the beginning of the game, can I put it onto my Bench?
No, you may not. In order to use Top Entry it has to be drawn from your deck at the beginning of your turn, but your turn has not started while you're setting up at the beginning of the game.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)
What happens if Cinderace V with the "Field Runner" Ability is in play while Galar Mine is also in play?
Cinderace V would have no Retreat Cost. When effects that increase something like Retreat Cost by a particular amount are stacked on top of effects that make something like Retreat Cost vanish, the vanishing effect takes priority.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)