Trainers » Lysandre
When playing Lysandre, who chooses which of the opponent's Benched Pokemon get brought forward?
The card says "Switch one of your opponent's Benched Pokemon..." so the person playing Lysandre gets to choose.
Source: Flashfire FAQ (2014-05-08), TPCi Rules Team (2014-05-08)
Trainers » Iris
Can you use Iris when your opponent has taken no prizes?
Yes, because it's possible for your opponent to take a prize during your turn if one of your Pokemon gets KO'd.
Source: TPCi Rules Team (2014-01-02), TPCi Rules Team (2014-05-08)
Trainers » Iris
Does the effect of Iris occur when you play it or when you attack?
Iris' effect looks at the game state at the time of the attack, not at the time when you play it.
Source: TPCi Rules Team (2014-01-02), TPCi Rules Team (2014-05-08)
Trainers » Evosoda
Can I use Evosoda to search for a Mega Pokemon?
As long as it evolves from the Pokemon you choose, yes.
Source: XY FAQ (2014-02-06), TPCi Rules Team (2014-02-06)
Trainers » Evosoda
If a Basic Pokemon was put into play last turn, can I use Evosoda on it twice to bring it all the way to a Stage 2?
No, you cannot. When you evolve a Pokemon it is a new Pokemon, and since it was put into play this turn you cannot use Evosoda on it until next turn.
Source: XY FAQ (2014-02-06), TPCi Rules Team (2014-02-06)
Attacks » Devolution Punch | Trainers » Devolution Spray | Gameplay » Evolving/Devolving
Can you use Devolution Spray or Golurk's "Devolution Punch" attack against a Mega Pokemon, and if so what happens to the Mega Pokemon?
Mega Pokemon are evolved Pokemon, so the Mega Pokemon card is removed, but the underlying Pokemon and all other cards attached stay in play (unless the Pokemon is KO'd, of course).
Source: XY FAQ (2014-02-06), TPCi Rules Team (2014-02-06)
Trainers » Max Revive
When using Max Revive, if I choose Blastoise can I put Wartortle & Squirtle into my deck too?
No, you only get to choose one Pokemon card, not an entire evolution line.
Source: XY FAQ (2014-02-06), TPCi Rules Team (2014-02-06)
Trainers » Super Potion
What happens if you play Super Potion for a Pokemon that doesn't have any energy cards attached to it?
You still remove 60 damage (or as much as you can), but that's all.
Source: XY FAQ (2014-02-06), TPCi Rules Team (2014-02-06)
Trainers » Professor Juniper | Errata » Professor Juniper | Errata » Professor Sycamore | Trainers » Professor Sycamore
While there are no functional changes to these cards [Professor Juniper and Professor Sycamore], you may not include both of them in your deck. That is, you may have up to 4 copies of Professor Juniper or up to 4 copies of Professor Sycamore - but if you have any Professor Juniper cards in your deck, you may not put any Professor Sycamore cards in your deck, and vice versa.
Source: TPCi Announcement (2013-10-01), TPCi Rules Team (2013-11-21)