If a player has some face up prize cards from using Blacephelon's "Blazer" attack and then takes a multi-prize knockout, do they take their prizes one at a time or must they take all of them at once?
Whenever you take more than one prize in a single action, each prize can be taken one at a time.
Source: TPCi Rules Team (2020-01-09)
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)
If I use Mimikyu's "Impersonation" attack to discard an opponent's Whitney, does that Whitney count for the "draw 2 cards for each other Whitney in your Discard Pile" because you're not actually playing that Whitney, just using its effect?
No, you still cannot count that Whitney towards the number of cards to be drawn because its text only includes any OTHER Whitney in your Discard Pile.
Source: TPCi Rules Team (2019-12-05)
When using Mimikyu's "Impersonation" attack, can I discard a Supporter like Green's Exploration or Morgan and bypass the requirement that says you can only play the Supporter if you do such-and-such?
You can discard those types of Supporter cards with Impersonation, but if you don't meet the Supporter card's requirements you cannot do what is says.
Source: TPCi Rules Team (2019-12-05)
What happens if I put a Keldeo GX with "Pure Heart" Ability into play after my opponent has used Latios GX's "Clear Vision GX" attack? Would my Keldeo GX be able to use its "Resolute Blade GX" attack or not?
As long as the Pure Heart ability is not blocked or turned off when Keldeo GX comes into play, it would be unaffected by Clear Vision GX.
Source: TPCi Rules Team (2019-12-05)
If I have a single Rainbow Energy attached to Moltres & Zapdos & Articuno GX, can I use the extra effect of its "Sky Legends GX" attack?
No, even though Rainbow Energy provides all energy types simultaneously, it only provides one unit of energy. You can use it for either the Fire or the Water or the Lightning, but you still need additional units of energy for the other required types.
Source: TPCi Rules Team (2019-11-14)
Can I use Mimikyu's "Copycat" attack to copy an attack like "Flare Strike" that says "this Pokemon can't use Flare Strike during your next turn" and then on my next turn use "Copycat" to copy that same attack again?
Attacks like Flare Strike put an effect on the Pokemon that prohibits using that particular attack on your next turn. But Mimikyu's Copycat attack doesn't have that restriction; so yes, you can use Copycat to copy Flare Strike multiple turns in succession.
Source: TPCi Rules Team (2019-11-14)
If I use Mimikyu's "Impersonation" attack, do I get to use the "when you play this card" part of Tag Team Supporters or not?
Impersonation gets to use all effects of the card; you still do the entire part of the card even if you're not "playing" it (but you still have to pay any required costs).
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)
If I'm not allowed to play a Supporter card for some reason, can I still use Mimikyu's "Impersonation" attack to use the effect of a Supporter?
Sure. You are not playing the Supporter, just using its effect.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)