When Dimension Valley is in play, if Mew EX uses its "Versatile" Ability to copy an attack from another Pokemon, will the attack's Energy cost be reduced by (C)?
If I play Lysandre's Trump Card and I have a Lysandre's Trump Card from a previous turn in the Discard pile does that card get shuffled back into my deck?
No, the wording on Lysandre's Trump Card that says "except for Lysandre's Trump Card" is referring to all Lysandre's Trump Cards in the Discard pile.
Source:
Phantom Forces FAQ (2014-11-13), TPCi Rules Team (2014-11-13)
I am playing a Robo Substitute from my hand to my Bench, but my opponent used Venomoth's "Dizzying Wind" attack last turn. Do I have to flip to play it?
Yes, Robo Substitute is a Trainer card when it is played.
Source:
Phantom Forces FAQ (2014-11-13), TPCi Rules Team (2014-11-13)