Do I use Radiant Venusaur's "Sunny Bloom" Ability before or after taking prize cards at the end of my turn?
Sunny Bloom is used at the end of your turn after attacking and checking for a KO but before Pokemon Checkup. So if your attack causes a KO, you would take Prize cards first, and then get to use Sunny Bloom.
Source: TPCi Rules Team (2022-08-04)
If my Radiant Greninja has already used its "Concealed Cards" Ability during my turn but then goes out of play, if I bring it back into play can I use "Concealed Cards" again on the same turn?
Yes, you can.
Source: TPCi Rules Team (2022-06-16)
On my last turn I attacked with Zebstrika's "Coordinated Bolt" attack. If Zebstrika gets KO'd or otherwise leaves play and on my next turn I use Zoroark's "Phantom Transformation" Ability to bring the Zebstrika back onto the Bench, can I use that Zebstrika's "Coordinated Bolt" attack with additional damage.
Yes, you can. Although Zebstrika left play and came back it is considered a different Pokemon on the previous turn.
Source: TPCi Rules Team (2022-06-09)
If I attach a Grass Energy to Skiploom with the "Solar Evolution" Ability but there are already 4 Jumpluff either in play or in the discard pile, can I still search my deck for that Pokemon and fail?
You cannot use Solar Evolution to search your deck since it is public knowledge that you won't find any Jumpluff if all four copies of the card are in known areas.
Source: TPCi Rules Team (2022-06-02)
If I have a Kecleon with the "Chromashift" Ability in play and two basic Water Energy and a basic Fighting Energy attached, and my opponent has a Jolteon with the "Thunderous Awakening" Ability and a Memory Capsule attached, would Kecleon still be considered a Fighting type Pokemon?
No, it would not. Thunderous Awakening would turn off Kecleon's Chromashift Ability completely, therefore Kecleon would be a Colorless type.
Source: TPCi Rules Team (2022-06-02)
Can I use Hisuian Samurott's "Wily Stance" Ability if there are no cards in my deck, just to discard an Energy?
No, you cannot.
Source: Astral Radiance FAQ; TPCi Rules Team (2022-05-26)
If I have Kricketune's "Swelling Tune" Ability in play, do my Kricketune Vs get +40 HP or not?
Swelling Tune is specifically referring to Kricketune, but "Kricketune V" is a different card name so it would get +40 HP.
Source: Astral Radiance FAQ; TPCi Rules Team (2022-05-26)
Can I use Hisuian Typhlosion's "Supernatural Orb" Ability if my opponent's Active Pokemon is already both Burned and Confused?
You may use Supernatural Orb if your opponent's Active Pokemon is either Burned OR Confused (or neither), but not if it is already both Burned AND Confused.
Source: Astral Radiance FAQ; TPCi Rules Team (2022-05-26)
Can I use Origin Forme Palkia VSTAR's "Star Portal" Ability to retrieve Wash Energy or Rapid Strike Energy from the discard pile?
No, Star Portal can only get basic {W} Energy, but Wash Energy and Rapid Strike Energy do not count as {W} Energy in the discard pile (nor in the deck, etc.).
Source: Astral Radiance FAQ; TPCi Rules Team (2022-05-26)