Can you evolve Ditto {*} into a Stage 1 Pokemon and then on a later turn place a new, different Stage 1 Pokemon onto it?
No, not unless you have devolved Ditto {*} somehow during a previous turn.
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)
If I have placed a Stage 1 Pokemon onto Ditto {*}, can I later evolve that into the corresponding Stage 2 Pokemon?
Yes, you can!
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)
Can you choose to not Confuse your opponent's active Pokemon if you attach Fairy Charm to a Tapu Lele that has the "Charmed Charm" Ability?
Yes, it is optional.
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)
What happens if I use Skiploom's "Floral Path to the Sky" Ability but fail to find a Jumpluff in my deck?
Skiploom stays in play, and since you searched your deck the ability is used up for the turn.
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)
What happens to any damage counters on Skiploom when it uses its "Floral Path to the Sky" Ability? Do they go on the Jumpluff that takes Skiploom's place?
Any damage counters on Skiploom are removed when it goes to the Lost Zone; they do not transfer to the Jumpluff that takes its place. Special conditions are not transferred to the new Jumpluff either.
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)
If you Knock Out a Pokemon using one of Tyranitar GX's attacks, do you get to take a prize card if the Pokemon is sent to the Lost Zone due to Tyranitar GX's "Lost Out" Ability?
Yes, you do. It is still Knocked Out.
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)
Does using Trumbeak's "Mountain Pass" Ability count as playing it from the hand? If so, would it be blocked if my opponent used Chimecho's "Bell of Silence" attack on the previous turn?
No, it is not being played from the hand. You are revealing the Trumbeak and then putting it into the Lost Zone; that is not blocked by Bell of Silence.
Source: TPCi Rules Team (2018-11-01)
What happens if you use Rayquaza GX's "Stormy Winds" Ability, but can only discard less than 3 cards from your deck? Do you get to attach a basic Energy card from your discard pile to Rayquaza GX or not?
If you can discard at least 1 card from your deck, you can use the Ability and attach a Basic Energy card from your discard pile. If you can't discard any cards, you can't use it.
Source: TPCi Rules Team (2018-08-16), TPCi Rules Team (2018-09-06)
If Voltorb is attacked by Blastoise EX's "Rapid Spin" which pushes it to the Bench after doing damage, do you still flip for Voltorb's "Destiny Burst" Ability or not?
Yes. Destiny Burst checks for two things: Voltorb was damaged by an attack while it was your Active Pokemon, and Voltorb was Knocked Out by that attack. So even though you don't check for a KO until the attack is completed, the criteria for using Destiny Burst has been met, so it can be used. This holds true for any similar Ability that triggers when the Pokemon is Active and gets damaged by an attack.
Source: XY FAQ (2014-02-06), TPCi Rules Team (2014-02-06), TPCi Rules Team (2018-08-09)
Does Venusaur's "Jungle Totem" Ability boost the damage output of Rayquaza GX's "Dragon Break" attack since "each Basic {G} Energy attached to your Pokemon provides {G}{G} Energy"?
Yes, just because the Basic Energy card is now providing two units of energy doesn't change the fact that it's still Basic Energy.
Source: TPCi Rules Team (2018-08-09)