Abilities » Power Huddle
If I have multiple Passimians in play, does each of their "Power Huddle" Abilities add 30 more damage to my Passimian's attacks?
Yes, Passimian's Power Huddle ability is stackable. Each Power Huddle does 30 more damage in addition to any damage Passimian's attack already does.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
Abilities » Flaming Fighter
If I have multiple Infernapes in play, does each of their "Flaming Fighter" Abilities add 6 more damage to my opponent's burned Pokemon in between turns?
No, Infernape's Flaming Fighter ability does not stack. You are simply placing 6 damage counters instead of 2, regardless of how many Infernapes are in play.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
Abilities » Evolutionary Advantage
Does Shinx have to be in play at the beginning of the turn in order to use its "Evolutionary Advantage" Ability?
It doesn't matter whether it was already in play or not, as long as it's during "the first turn of the person going second".
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
Errata » Cyrus {*} | Trainers » Cyrus {*}
The text on Cyrus{*} should say, "You can play this card only if your Active Pokémon is a {W} or {M} Pokémon". The original text says you can't play this card unless you have a {W} or {M} Pokémon in play, but the intended requirement is to have a {W} or {M} Pokémon as your Active Pokémon.
Source: Organized Play News (2018-01-24)
Trainers » Ninja Boy | Attacks » Type Switch
If I use Arceus' "Type Switch" attack and choose a type, what happens if I use Ninja Boy to switch Arceus for a Basic Pokemon of a different type? Does the new Pokemon become both types or does the new type supersede the choice from "Type Switch"? Or what if you Ninja Boy for a dual-type Pokemon like Volcanion EX that is Fire/Water?
The type chosen by Type Switch overrides the Pokemon's actual type, so the new Pokemon would become the type chosen rather than its regular type. And in the case of a dual-type Pokemon it would become the single type that you chose for Type Switch.
Source: TPCi Rules Team (2017-12-21)
Attacks » Intentional Grounding | Attacks » Sand Attack
If your opponent used Sandshrew's "Sand Attack" on the previous turn, and you attack with Passimian's "Intentional Grounding" which requires you to discard a Tool from your hand or the attack does nothing, do you discard the Tool before you flip for the Sand Attack effect or after?
Flip for the Sand Attack effect first; if it's tails your attack ends immediately, or if it's heads you proceed with your attack as normal.
Source: TPCi Rules Team (2017-12-14)
Attacks » Watch and Learn
If my opponent uses Sudowoodo's "Watch and Learn" attack to copy the attack my Pokemon used last turn, what would happen if I use my own Sudowoodo's "Watch and Learn" attack on my following turn?
Your Sudowoodo would copy your opponent's Watch and Learn attack, not the attack your opponent copied. So unfortunately your Watch and Learn would do nothing.
Source: TPCi Rules Team (2017-12-07)
Attacks » Trickster GX
Zoroark GX's "Trickster GX" attack allows you to copy an attack from any of your opponent's Pokemon. Does this allow you to copy an opponent's GX attack or not? If so, what if your opponent has already used up their GX attack for the game?
Yes, Trickster GX can copy an opponent's GX attack, even if the opponent has already used up their GX attack for the game. It does not count as using 2 GX attacks.
Source: TPCi Rules Team (2017-12-07)
Attacks » Lighting GX
If I use Xurkitree GX's "Lighting GX" attack to put a card from my opponent's hand face-down as one of their prize cards, should we mix up the prizes so he doesn't know which one it is or does it stay wherever I put it?
Rearranging the prize cards is not part of the attack, so wherever you put the new prize card is where it should stay until some other action causes the prize cards to be rearranged.
Source: TPCi Rules Team (2017-12-07)
Trainers » Peeking Red Card
I'm confused by the text on Peeking Red Card. After the opponent shuffles their hand into their deck, who gets to draw that many cards, the opponent or me?
The opponent gets to draw that many cards.
Source: Crimson Invasion FAQ (2017-10-20), TPCi Rules Team (2017-11-02)