Attacks » Impersonation
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)
Attacks » Impersonation
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)
Attacks » Clear Vision GX | Abilities » Pure Heart
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)
Attacks » Sky Legends GX
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)
Attacks » Copycat
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)
Attacks » Impersonation
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)
Attacks » Impersonation
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)
Attacks » Recall
If I use Charizard's "Recall" attack to use Charmeleon's "Slash" attack, do I need to have the required energy cost to use "Slash"?
No, Charizard just needs the one energy required to use Recall. You do not need to meet the energy requirement from the previous Evolution's attack, but if that attack requires you to do something with energy (like discarding an energy card) you must follow that attack's instructions.
Source: TPCi Rules Team (2016-02-11), Cosmic Eclipse FAQ (2019-10-18), Cosmic Eclipse FAQ (2019-10-31)
Attacks » Massive Catch GX
What happens if my bench is full when I use Wishiwashi GX's "Massive Catch GX" attack? Can I put down more Pokemon than I would normally have space for on my bench?
Sorry, but no. You can't put more Pokemon on your bench than you are allowed to.
Source: Cosmic Eclipse FAQ (2019-10-18), TPCi Rules Team (2019-10-31)