On my last turn, I attacked with Zebstrika's "Coordinated Bolt" attack. If I use a different Zebstrika's "Coordinated Bolt" this turn, will it do extra damage?
Yes, that would work.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
On my last turn, I attacked with Blitzle's "Thunder Spear" attack. If I evolve it into Zebstrika this turn and use "Coordinated Bolt", will it do extra damage?
Yes, Zebstrika is not the Pokemon that attacked last turn; Blitzle was your other Rapid Strike Pokemon that used an attack on the previous turn.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
On my opponent's last turn, they flipped heads for Diglett's "Dig" attack. If I use Blissey V's "Blissful Blast" attack on my turn, would I be able to attach Energy cards from my discard pile?
No. Since Blissful Blast did no damage due to Dig, you cannot get any Energy cards from the discard pile with Blissful Blast.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
Can I use Shadow Rider Calyrex VMAX's "Underworld Door" Ability if there are no cards left in my deck to draw from?
Yes, you can. Attaching Psychic Energy is the main effect of the Ability, which means it can be used even if you have 0 cards in your deck.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
If I use Shadow Rider Calyrex VMAX's "Underworld Door" Ability, do I have to draw 2 cards?
Yes, it is not optional (it does not say "you may"). You must draw 2 cards if you are able to; you can only draw a single card if it's the last card in your deck.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
Does Passimian's "Throwing Coach" Ability work if my Active Pokemon's attack doesn't do any damage to the opponent's Bench?
No, Throwing Coach only adds +30 more damage when you actually do damage to your opponent's Benched Pokemon. In other words, you have to do some bench damage in order to have "+30 more" done.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
Can I use Galarian Slowking's "Mysterious Potion" Ability on a Pokemon that isn't damaged?
Yes, you could try to damage your own Pokemon if you really wanted to.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
Can I choose to search my deck for zero cards if Gengar with the "Last Gift" Ability is Knocked Out (for example, if I don't want to empty my deck)?
Since the search is not optional (it does not say "you may") you must take at least one card if you are able to.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
If Path to the Peak is in play, can I use Liepard V's "Hidden Claw" Ability when I play it from my hand onto my Bench?
No, Liepard V is considered in play by the time Hidden Claw activates, so it won't work due to Path to the Peak.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
If Kecleon has no Energy attached and I attach a Psychic Energy to it when Old Cemetery is in play, will Kecleon's "Chromashift" Ability kick in before checking for Old Cemetery or will Kecleon get 2 damage counters?
Old Cemetery's effect will happen first, so Kecleon will receive 2 damage counters.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)