Trainers » Professor's Research | Errata » Professor's Research
In the Expanded format, there's already a rule that says you can't include Professor Sycamore and Professor Juniper in the same deck; players must choose one or the other. The same rule applies to Professor's Research, meaning it cannot be in the same deck as Professor Sycamore or Professor Juniper.
Source: TPCi Announcement (2020-01-09), TPCi Rules Team (2020-01-09)
Errata » Sitrus Berry | Trainers » Sitrus Berry
The wording of Sitrus Berry is now as follows, "At the end of each turn, if the Pokémon this card is attached to has 3 or more damage counters on it, heal 30 damage from it and discard this card."
Source: TPCi Announcement (2020-01-09), TPCi Rules Team (2020-01-09)
Attacks » Altered Creation GX | Trainers » Channeler
Does Channeler negate the effects of Arceus & Dialga & Palkia GX's "Altered Creation GX" attack?
It depends on who is playing the Channeler. If the player who used Altered Creation GX uses Channeler then the effects are removed; the player's Pokemon no longer do +30 damage and the player does not get to take any extra prizes from the effect. However, if the player's opponent plays Channeler, then Altered Creation GX effects are not removed as they reside on the other player (who did not play Channeler).
Source: TPCi Rules Team (2020-01-09)
Trainers » N's Resolve
Can you use N's Resolve if you have no Dragon Pokemon on your Bench?
No. You have to have a Dragon Pokemon in play in order to play this card. The intention is that the main effect of the card is to attach basic Energy cards to your Benched Dragon type Pokemon, so if you don't have a Dragon type Pokemon on your Bench, you can't play the card. (You also can't play the card if you have 0 cards remaining in your deck.)
Source: TPCi Rules Team (2019-12-05)
Trainers » Island Challenge Amulet
If I attach Island Challenge Amulet to a Pokemon-GX that has less than 100 HP left and it's Knocked Out, does my opponent take only 1 prize?
No. You only get the reduction in Prize Cards taken if it is Knocked Out by damage from an opponent's attack.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Acro Bike
Can I play Acro Bike if there's only one card left in my deck? And if so, do I put that one card into my hand or discard it, or do I get to choose?
You can play Acro Bike with only one card left in your deck; but you have to put it into your hand, you cannot discard it.
Source: TPCi Rules Team (2019-10-31)
Abilities » Dance of Tribute | Trainers » Lillie's Poke Doll
If my Lillie's Poke Doll was Knocked Out by my opponent, can I use Oricorio GX's "Dance of Tribute" Ability?
Yes, even though they didn't take a prize, Lillie's Poke Doll was still considered a Knock Out of one of your Pokemon.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Mallow & Lana
You can play Mallow & Lana as long as you have a Benched Pokemon. But if your Active Pokemon is not damaged, you cannot discard 2 cards from your hand.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)