If I use Fantina and then my Flying Pikachu V with Big Parasol attached uses its "Fly" attack and successfully lands heads, would my opponent's Giratina V's "Shred" attack do any damage to Flying Pikachu V or not?
Shred isn't affected by "any effects on the Defending Pokemon"; so the effects from Fantina and Big Parasol and Fly would all be ignored, and Shred would do damage.
Source: TPCi Rules Team (2022-09-29)
If I have a heavily damaged Basic Pokemon V in play, can I use Thorton to switch it with a regular one-prize Basic Pokemon from my discard pile?
Yes, and if the new Basic Pokemon has less HP than the amount of damage counters it is immediately KO'd and will relinquish only one prize to your opponent.
Source: TPCi Rules Team (2022-09-29)
If I have Comfey in play and I use its "Flower Selecting" Ability, can I then use Thorton to switch it with a different Comfey and use "Flower Selecting" from the new Comfey?
No, that won't work. Even though the new Comfey is a different Pokemon than the first one, it remembers the Flower Selecting Ability was already used this turn so you cannot use it again on that Pokemon.
Source: TPCi Rules Team (2022-09-29)
Can I use Thorton to put a non-Dark Basic Pokemon from my discard pile onto my bench if I have Eternatus VMAX with the "Eternal Zone" Ability in play?
No, you can't play Thorton at all if there aren't any Basic {D} Pokemon in your discard pile.
Source: TPCi Rules Team (2022-09-29)
If I have Milotic with "Dew Guard" Ability in play, what happens if my opponent plays Riley?
Your opponent reveals the top 5 cards of their deck but you would not choose 2 cards, and they get to put all 5 cards into their hand.
Source: TPCi Rules Team (2022-09-29)
If I have Milotic with "Dew Guard" Ability in play, what happens if my opponent plays Choy?
Dew Guard prevents you from revealing your hand, but your opponent still reveals their hand and draws 3 cards.
Source: TPCi Rules Team (2022-09-29)
What happens if a Pokemon with Splash Energy attached is Knocked Out by an attack while Lost City stadium is in play?
The order of resolution for the effects can be decided by the owner of the Pokemon with Splash Energy attached to it. So the Pokemon can either go to the Lost Zone and stay there, or use Splash Energy to return the Pokemon to your hand.
Source: TPCi Rules Team (2022-09-08)
Can I play Single Strike Mustard if my Bench is full?
No, you cannot play the card. Since the Bench is full you cannot search your deck, and since you did not search your deck you do not get to draw 5 cards.
Source: TPCi Rules Team (2022-09-08)
If I have 5 cards in my Lost Zone and my opponent has 5 cards in their Lost Zone, can I use Sableye's "Lost Mine" or Giratina VSTAR's "Star Requiem" attack or Fantina?
No. Each player has a separate Lost Zone above their Prize Cards that they put cards into. You yourself must have 10 cards in your Lost Zone in order to do either of those attacks or to play Fantina.
Source: Lost Origin FAQ; TPCi Rules Team (2022-09-08)