If Vileplume's "Allergy Panic" Ability is in effect, does Rayquaza's "Shred" attack consider a Defending Pokemon's weakness as x2 or x4?
Shred isn't affected by "any effects on the Defending Pokemon", but the term "any effects" does not include effects that alter Weakness or Resistance. So in this case the Defending Pokemon's Weakness would be x4 due to Allergy Panic.
Source: TPCi Rules Team (2013-02-28), TPCi Rules Changes Announcement (2017-05-03), TPCi Rules Changes Announcement (2017-05-18)
What happens if I have less than three spaces on my bench when using Politoed's "Roll Call" attack? Or what if I don't have any room on my bench at all?
You can use the attack no matter how many Pokemon are on your Bench, but you can only get as many Pokemon as you have spaces on your Bench.
Source: Guardians Rising FAQ (2017-04-22), TPCi Rules Team (2017-05-04)
What happens if I use Politoed's "Roll Call" attack and cannot find a Poliwag, Poliwhirl and/or Poliwrath in my deck?
When performing an attack you do as much of it as you can. And since the contents of the deck are unknown you can also voluntarily fail to find one or more of the Pokemon you are searching for.
Source: Guardians Rising FAQ (2017-04-22), TPCi Rules Team (2017-05-04)
What happens to Gothitelle's "Tractorbeam" attack if the opponent has no benched Pokemon?
If you can't switch a new Pokemon, the attack doesn't do any damage.
Source: Guardians Rising FAQ (2017-04-22), TPCi Rules Team (2017-05-04)
On the turn after using Dragonair's "Dragon's Wish" attack, when I attach any number of Energy cards from my hand do I have to attach them all at once, or can I attach them whenever I want during my turn?
You do not have to attach them all at once. You can attach them from your hand whenever you like during the duration of your turn following Dragon's Wish.
Source: Sun & Moon FAQ (2017-02-02), TPCi Rules Team (2017-02-02)
Can I have Clefairy's "Metronome" copy a GX attack, and if so does it use up my "one GX attack per game"?
Yes you can, and yes it does. Also if you've already used your GX attack for the game, then you cannot choose a GX attack with Metronome.
Source: TPCi Rules Team (2017-01-05), Sun & Moon FAQ (2017-02-02)
If Magearna EX with the "Mystic Heart" Ability is in play, are all Pokemon with Metal Energy attached protected from Greninja's "Shadow Stitching" attack?
If Magearna EX has a Metal Energy attached to it, all Pokemon with Metal Energy attached are protected; however, if Magearna EX does not have a Metal Energy attached to it, its Mystic Heart Ability is shut off and no Pokemon with Metal Energy attached are protected.
Source: TPCi Rules Team (2017-02-02)
If I use Dragonair's "Dragon's Wish" attack and then on the following turn evolve it to Dragonite, can I still attach the energies or not?
Yes, absolutely! The Dragon's Wish effect resides on the player, not on the Pokemon.
Source: Sun & Moon FAQ (2017-02-02), TPCi Rules Team (2017-02-02)
If Darkrai attacks with "Abyssal Sleep", can Pokemon Ranger clear the effect of flipping 2 coins when Asleep?
Asleep, Poisoned, etc. are Special Conditions, regardless of how many coins you need to flip or how much damage the poison condition does. Therefore they are not altered by Pokemon Ranger.
Source: TPCi Rules Team (2016-11-10), TPCi Rules Team (2016-12-08)
If I used Mewtwo's "Barrier" attack last turn and this turn I play Pokemon Ranger, does that clear the effect so I can use "Barrier" again this turn?
No, Barrier does not "place an effect" to prevent its use on the next turn (unlike attacks such as "Volcanic Heat" which says "this Pokemon" cannot attack next turn). Instead, the attack does a Game State check to see if it was used last turn. Since there is no effect to clear, Pokemon Ranger won't allow you to use Barrier two turns in a row.
Source: TPCi Rules Team (2016-11-03), TPCi Rules Team (2016-12-01)