If I have two Magnezones in play with the "Dual Brains" Ability, does that mean I can play 4 Supporters during my turn?
No, you cannot. Dual Brains says you may play 2 Supporters, period; it doesn't say "an extra supporter" for each Magnezone.
Source: Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)
If my Active Pokemon is Togekiss with the "Bright Veil" Ability, do I bring up one of my benched Pokemon when my opponent plays an Escape Rope?
No. Bright Veil prevents your part of the "Each player switches his or her Active Pokemon" part of Escape Rope, so your Active Pokemon stays put and you can't bring up a benched Pokemon. However, your opponent does switch.
Source: Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)
If my opponent's Active Pokemon is Snorlax with the "Block" Ability, what happens to my Active Pokemon if I play Scramble Switch?
Scramble Switch causes your Pokemon to switch, but Block only prevents Retreating. You can switch your Active Pokemon when Scramble Switch is played.
Source: Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)
If my Active Pokemon is Snorlax with the "Block" Ability, what happens to my opponent's Active Pokemon if I play Escape Rope?
Escape Rope causes the Pokemon to switch, but Block only prevents Retreating. The opponent switches their Active Pokemon when Escape Rope is played.
Source: Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)
When Braviary uses its "Big Wing" Ability, who chooses which of the opponent's Benched Pokemon get brought forward?
The ability says "have your opponent switch..." so the opponent gets to choose.
Source: Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)
Say I have Liepard active and Raikou-EX and Victini on my bench. I attack with Liepard's "Assist", flip heads and choose to copy Raikou-EX's "Thunder Fang" attack but flip tails for "Thunder Fang's" paralysis part. If I then use Victini's "Victory Star" Ability to re-flip the coins, assuming I get heads for "Assist" could I choose a different benched Pokemon's attack or would I have to choose "Thunder Fang" again?
Since Victory Star rewound all the coin flips it's as if the Assist attack never happened. So yes, you could choose a different benched Pokemon's attack, if you flip heads for Assist of course.
Source: TPCi Rules Team (2013-01-31)
If I have 6 cards in my hand including a Hugh, and my opponent has 5 cards, can I play Hugh or not?
No, you cannot. After playing Hugh both players would have exactly 5 cards in their hands, and you cannot play a Trainer card for no effect.
Source: TPCi Rules Team (2013-01-03)
If I have a Liepard with 3 Darkness Energies on it and I use "Assist", can I use Charizard's "Scorching Fire" attack despite not having a Fire Energy to discard?
Yes, you can. The damage amount is done regardless of whether Liepard has any Fire Energy attached to it or not, but if you do have a Fire Energy attached to Liepard you must discard it.
Source: TPCi Rules Team (2012-11-29)
Since Skyla says "Search your deck for a Trainer card", does this allow me to search for any kind of Trainer including Supporters, and Stadiums?
Yes, it does. The current definition of "Trainers" includes Items, Supporters, and Staduims.
Source: Boundaries Crossed FAQ (2012-11-08), TPCi Rules Team (2012-11-08)
If Crystal Wall is attached to Black Kyurem-EX, can anything raise its maximum HP beyond 300 (ike if it were somehow made Colorless and Aspertia City Gym is in play)?
Crystal Wall essentially replaces Black Kyurem-EX's printed HP with 300, and anything to add or reduce HP would work accordingly.
Source: Boundaries Crossed FAQ (2012-11-08), TPCi Rules Team (2012-11-08)