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 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)
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 I use Random Receiver and the very first card revealed is a Supporter, do I still have to shuffle my deck?
Yes, you must shuffle your deck regardless of how many cards were revealed for Random Receiver.
Source: TPCi Rules Team (2012-09-13)
If I use Quick Ball and the very first card revealed is a Pokemon, do I still have to shuffle my deck?
Yes, you must shuffle your deck regardless of how many cards were revealed for Quick Ball.
Source: PUI Rules Team (2007-10-25), TPCi Rules Team (2012-09-013)
Can I use two Devolution Sprays on the same Pokemon in the same turn, to devolve from a Stage 2 to Stage 1 and then to Basic?
Yes, you can.
Source: Dragons Exalted FAQ (2012-08-23), TPCi Rules Team (2012-08-23)
When I put Shedinja onto my bench using Ninjask's "Cast-off Shell" Ability, can Eviolite help protect it from damage?
No, because Shedinja is not a "Basic Pokemon"; it is an unevolved Stage-1 Pokemon.
Source: TPCi Rules Team (2012-08-23)
If an evolved Pokemon is Knocked Out with Rescue Scarf attached to it, do you get to put all of the evolution stage cards and Basic Pokemon card back into your hand, or just the highest stage Evolution card?
All of them go to back into your hand.
Source: Dragons Exalted FAQ (2012-08-23), TPCi Rules Team (2012-08-23)
Can I use Heavy Ball to look for a LEGEND Pokemon half?
No, you cannot. The Retreat Cost is only printed on one half of the LEGEND Pokemon. If it is printed on both cards, then it is a common attribute for both pieces; but since it is printed on only one half it only applies to the LEGEND Pokemon when both pieces are in play.
Source: TPCi Rules Team (2012-04-05)