What happens if I use Smeargle's "Portrait" Poke-POWER, but I cannot satisfy the conditions of any of my opponent's Supporters?
You get to look at the opponent's hand, and that's all.
Source: PUI Rules Team (2010-12-09)
When using Smeargle's "Portrait" Poke-POWER, can I choose a Supporter that will have no effect?
You cannot pick a supporter you couldn't normally use; for example you can't choose "Twins" unless you are behind on prizes at that time, nor Aaron's Collection if you don't have anything in your Discard Pile. You would have to choose a different Supporter if one is available.
Source: PUI Rules Team (2010-12-09)
Can I use Machamp's "Fighting Tag" Poke-POWER to switch him with the Active Pokemon if the current Active has no Fighting Energy attached to it?
No, if you don't move any Fighting energy you cannot switch Machamp with the Active Pokemon.
Source: PUI Rules Team (2010-11-18)
When Yanmega tries to attack, do you evaluate the number of cards in your hand for the "Insight" Poke-BODY before or after discarding a card for Giratina Lv.X's "Invisible Tentacles" Poke-BODY?
The Insight Poke-BODY is evaluated before your attack even begins; therefore it is checked before discarding any cards for Invisible Tentacles.
Source: PUI Rules Team (2010-11-11)
If an opponent's evolved Pokemon is Knocked Out while Gengar is Active, does the "Catastrophe" Poke-BODY put all of the evolution stage cards and Basic Pokemon card in the Lost Zone, or just the highest stage Evolution card?
The evolved Pokemon and any of its pre-evolved stages and Lv.X cards go to the Lost Zone, and all attached Energy, Tools, etc. go to the Discard Pile.
Source: Triumphant FAQ (2010-11-04), PUI Rules Team (2010-11-04)
Can Mew's "Lost Link" Poke-BODY use the attack of one half of a LEGEND Pokemon if its card is in the Lost Zone? Or what if both halves of the LEGEND Pokemon are in the Lost Zone?
No, you cannot. If a LEGEND Pokemon's cards are not in play, you cannot reference its attacks, Poke-POWER, Poke-BODY, etc.
Source: Triumphant FAQ (2010-11-04), PUI Rules Team (2010-11-04)
If I use an attack that Knocks Out a defending Gengar with the "Castastrophe" Poke-BODY, but it also knocks itself out, does the attacking Pokemon go to the Lost Zone, or is "Catastrophe" no longer in effect when Gengar is KO'd?
Since both Pokemon are KO'd at the same time, Gengar's Catastrophe Poke-BODY is still working at the point when Knock Outs are evaluated. So the attacking Pokemon would go to the Lost Zone.
Source: Triumphant FAQ (2010-11-04), PUI Rules Team (2010-11-04)
If my Active Pokemon does an attack that Knocks Out an opponent's Pokemon, but also switches my Active Pokemon to the Bench, would the Knocked Out Pokemon go to the Lost Zone if I bring up Gengar with the "Castastrophe" Poke-BODY?
Yes. Gengar is active at the end of the attack when Knock Out conditions are evaluated.
Source: Triumphant FAQ (2010-11-04), PUI Rules Team (2010-11-04)
What happens if I attach a Rainbow Energy to Roserade with the "Energy Signal" Poke-POWER? Do I get to use both effects?
If the Energy card you attached provides all types (for example, Rainbow Energy), then both effects would trigger. Energy Signal would both Confuse and Poison the Defending Pokemon.
Source: PUI Rules Team (2010-09-30)
When I use Smeargle's "Portrait" Poke-POWER to look at my opponent's hand, can I terminate the power's effect without choosing a Supporter card?
No, you cannot. You must choose a Supporter card when you use the effect if the opponent has one in their hand.
Source: Undaunted FAQ (2010-09-09), PUI Rules Team (2010-09-09)