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)
If my Active Pokemon has no Weakness and my opponent uses Porygon's "Conversion 3" attack to make its Weakness {F}, what happens if it is attacked by a {F} Type Pokemon next turn? How much extra damage is done?
If a Pokemon has no Weakness printed on the card, Conversion 3 will give that Pokemon a x2 Weakness of the chosen type.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03), TPCi Rules Team (2016-12-01)
When using Imakuni?'s Doduo's "Harmonize" attack, if I'm still singing when it comes back to my turn, can I use "Harmonize" again?
The attack says "from the moment you use this attack you must begin to sing a song". So if you use Harmonize again you have to start a song over from the beginning (you may sing the same song if you wish) and the prior attack's damage gets placed immediately. It does not stack, sorry.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)