Will Eevee's "Energy Evolution" ability still trigger if it has an Energy attached to it while it's affected by a Special Condition?
There is no text on the card to say it's shut off, so it still works even when afflicted by a Special Condition.
Source: Furious Fists FAQ (2014-08-28), TPCi Rules Team (2014-08-28)
If Eevee only has 10 HP left and Frozen City is in play, would it be KO'd before I have a chance to use its "Energy Evolution" ability by attaching a Basic Energy?
No, it would not. All triggered effects have to be resolved before checking for KO's, so you would take the +10 damage for Frozen City first, then use Energy Evolution to search your deck. Of course, if you fail the search and Eevee's damage is greater than or equal to its HP, then Eevee is KO'd.
Source: TPCi Rules Team (2014-08-28)
If I attach a Basic Energy to Eevee and trigger its "Energy Evolution" ability but choose an evolution belonging to Team Plasma, would I take the damage from Frozen City stadium or not?
The mandatory effect of the Frozen City stadium comes before the optional effect of Energy Evolution. If the Eevee is not a Team Plasma Pokemon before choosing whether to use Energy Evolution, you would take the damage from Frozen City.
Source: TPCi Rules Team (2014-08-28)
If I have more than one Machamp in play, do I get +20 damage for each one of them?
Yes, but only for each one that has the "Fighting Fury" Ability.
Source: Furious Fists FAQ (2014-08-28), TPCi Rules Team (2014-08-28)
Is Klefki's "Secret Key" ability stackable? Can you increase Resistance by -40 for each of them?
No, regardless of how many Klefki you have in play you only get a maximum Resistance of -40 from Secret Key.
Source: Furious Fists FAQ (2014-08-28), TPCi Rules Team (2014-08-28)
If I use Dusknoir's "Sinister Hand" Ability to KO my opponent's Active Pokemon, can I wait until my opponent replaces his or her Active Pokemon before taking my prize(s)?
No, per the rulebook you must take your prizes first, and then the opponent replaces his or her Active Pokemon.
Source: TPCi Rules Team (2014-08-28)
For Eevee, can you attach an energy and use its "Energy Evolution" ability and evolve on your first turn? How about on Eevee's first turn in play?
Yes. You can evolve on your first turn and also on the turn that you played Eevee via this Ability.
Source: Furious Fists FAQ (2014-08-28), TPCi Rules Team (2014-08-28)
Can I use Evosoda on a Caterpie the first turn of the game or the turn that Caterpie is played since "Adaptive Evolution" says it can evolve in those cases?
No, you can't use Evosoda to evolve in either of those conditions because the text on Evosoda specifically prevents it.
Source: TPCi Rules Team (2014-05-29)
Emolga with a Grass energy attached is poisoned and uses its "Call For Family" attack to get Virizion EX with "Verdant Wind" ability. Does it take poison damage or not?
No, because Virizion EX is in play before the end of the turn and Poison damage is taken between turns.
Source: TPCi Rules Team (2014-01-02), TPCi Rules Team (2014-05-08)
Can I use Caterpie's "Adaptive Evolution" Ability to evolve into Metapod, then immediately use Metapod's "Adaptive Evolution" Ability to evolve into Butterfree all on the same turn?
Yes, you can.
Source: Flashfire FAQ (2014-05-08), TPCi Rules Team (2014-05-08)