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)
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)
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)
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 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)
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 a Pokemon normally has no Weakness, does Vileplume's "Allergy Panic" Ability give it a x4 Weakness instead?
No, if a Pokemon doesn't have Weakness, you cannot *apply* any Weakness multiplier to it at all.
Source: Boundaries Crossed FAQ (2012-11-08), TPCi Rules Team (2012-11-08)
If I use Cresselia-EX's "Psychic Protection" attack, does Vileplume's "Allergy Panic" Ability override and give it a x4 Weakness instead?
No, since there is no longer a weakness there is nothing for Allergy Panic to multiply.
Source: Boundaries Crossed FAQ (2012-11-08), TPCi Rules Team (2012-11-08)
If a Pokemon normally has no Retreat Cost, does Jellicent's "Stickiness" Ability give it a Retreat Cost of (*) instead?
Yes, Stickiness adds +1 to each of the opponent's Pokemon's Retreat Costs. However, if the Retreat Costs are set to zero by an effect such as Darkrai-EX's "Dark Cloak" Ability, they cannot be increased by Stickiness.
Source: Boundaries Crossed FAQ (2012-11-08), TPCi Rules Team (2012-11-08)
If I have Ditto with "Transform" in play this turn, on my next turn can I put a Basic Pokemon from my hand on top of Ditto and then immediately evolve it into a Stage 1 or use Rare Candy to evolve it to Stage 2?
Yes, you can. Ditto says "Any cards attached to this Pokemon, damage counters, Special Conditions, turns in play, and any other effects remain on the new Pokemon"; so as long as Ditto has been in play for more than a turn it satisfies the evolutionary requirement, and the Basic Pokemon card placed on Ditto can be evolved or used with Rare Candy immediately.
Source: Boundaries Crossed FAQ (2012-11-08), TPCi Rules Team (2012-11-08)