Trainers » Bellelba & Brycen-Man
You can play Bellelba & Brycen-Man as long as there's at least 1 card in either player's deck. It can also be played by discarding 3 cards from your hand if at least 1 player has more than 3 Benched Pokemon. But if at least 1 player doesn't have more than 3 Benched Pokemon, you cannot discard cards from your hand.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Red & Blue
You can do any part of Red & Blue as long as there's a Pokemon in play that can evolve into a Pokemon-GX AND there's at least 1 card in your deck.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Chaotic Swell
If I try to play a Stadium card but it is discarded by the effect of Chaotic Swell stadium, can I play another one?
No, it was immediately discarded without effect, but you already played a Stadium card which can only be done once per turn.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Abilities » Blow-Away Bomb | Trainers » Roxie
When I use Roxie to discard two Pokemon that each have the "Blow-Away Bomb" Ability, do those abilities stack so I can place two damage counters on each of my opponent's Pokemon?
Yes, each of the Pokemon gets to use their own "Blow-Away Bomb" Ability when discarded by Roxie.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Cynthia & Caitlin
You can play Cynthia & Caitlin as long as there's a Supporter card in your discard pile. You can also play it by discarding a card from your hand if there's at least 1 card in your deck. But if you have no cards in your deck, you cannot discard a card from your hand.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Erika
Can I play Erika if both I and my opponent decide not to draw any cards?
Yes, because it is not known by you or the game whether your opponent will draw cards or not.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Will
If my opponent used Magnemite's "Mirror Shot" attack last turn, can I use the effect of Will to choose heads for the effect of the attack?
Yes, that is considered an effect of an attack, so that works.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Guzma & Hala
When I play Guzma & Hala, after I search my deck for a Stadium, do I have to shuffle first if I'm also going to search for Special Energy and a Tool?
You can skip the shuffling after the Stadium search as long as you clearly tell your opponent you're doing the second part of the card. So if you're doing both parts you first discard two cards from your hand, then search for any Stadium you're going to take, then search for the Tool and Special Energy, then shuffle your deck.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Will
If my Pokemon is Confused, can I use the effect of Will to choose Heads for the Special Condition?
No, that isn't something that Will can affect.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
Trainers » Guzma & Hala
When I play Guzma & Hala, can I discard the Stadium I searched for as one of the 2 cards discarded to search for the Tool and Special Energy?
If you want to do the second effect you have to discard 2 cards "when you play this card", that is before you search for the Stadium.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)