When using Centiscorch VMAX's "G-Max Centiferno" attack, can I get a Heat Energy from my discard pile?
No, you may not. Heat Energy only counts as a Fire Energy card while it is attached to a Pokemon, not when it is in the discard pile or anywhere else.
Source: TPCi Rules Team (2020-08-13)
When using Centiscorch VMAX's "G-Max Centiferno" attack, do I get +40 more damage for the Fire energy I attach during the attack?
No, the attachment of Fire Energy from the discard pile takes place after the damage calculation of the attack is done. Also, you don't get to attach the Fire Energy if the attack didn't do any damage.
Source: Darkness Ablaze FAQ (2020-07-31), TPCi Rules Team (2020-08-13)
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)
When using Diggersby's "Mining Rush" attack, can I discard cards one at a time or do I have to discard them all at once?
You may discard cards one by one for Mining Rush and stop any time before you reach the maximum amount specified in the attack. You do not have to declare up front how many cards you're going to discard.
Source: TPCi Rules Team (2020-05-07)
Am I allowed to use Gossifleur's "Call for Family" attack if my Bench is already full?
You can use the attack, but since it's public knowledge that you can't put any Pokemon onto your Bench the entire effect of the attack fails; you can't even search your deck.
Source: Supreme Victors FAQ (2009-08-27), PUI Rules Team (2009-08-27), PUI Rules Team (2020-05-07)
Does Cinderace VMAX's "Counter" attack do extra damage if Cinderace VMAX goes to the Bench and then returns to the Active Slot?
It doesn't matter where Cinderace VMAX was when it was damaged during your opponent's last turn, nor whether it has switched in or out of the Active Slot. If it was damaged by an attack during your opponent's last turn Counter will do that much more damage. This is not an effect to be removed when the Pokemon goes to the bench. Counter is performing a game state check asking if something happened; since it did, it uses that game state information to calculate how much damage Counter will do.
Source: TPCi Rules Team (2020-05-07)
When using Ninetales V's "Nine-Tailed Shapeshifter" attack, do I need to have the correct amount and types of energy that match the opponent's Active Pokemon's attack that I'm choosing?
No, you do not. You only need the energy required by the Nine-Tailed Shapeshifter attack.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)
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)
What happens if I use Bronzong's "Gyro Ball" attack but I don't have any benched Pokemon?
You have to switch Bronzong if you are able to; the "if you do" part refers to when you have no Benched Pokemon. So if Bronzong doesn't switch the opponent's Active Pokemon doesn't switch either.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)