If I have Focus Sash attached to Marshadow & Machamp GX and then use its "Acme of Heroism GX" attack, which one takes precedence if Marshadow & Machamp GX would be KO'd by damage from an opponent's attack?
You would choose, as they have the same effect, you choose the order of resolution.
Source: TPCi Rules Team (2019-06-27)
If my opponent has no Weakness and I use Meowstic's "Perplexing Eyes" attack, will I do extra damage on my next turn due to Weakness?
If a Pokemon has no Weakness printed on the card, Perplexing Eyes will give that Pokemon a x2 Weakness to Psychic.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02), TPCi Rules Team (2019-05-16)
If I have Celesteela GX with "Force Canceler" Ability active, what happens if my opponent uses Venomoth GX's "Ten-Card Return GX" attack?
The damage portion gets blocked, but your opponent still gets to shuffle their hand into their deck and draw 10 cards because that part is not being done to YOUR Pokemon.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-09)
When I use Meowstic's "Perplexing Eyes" attack does it change my opponent's active Pokemon's weakness before I do damage?
No. Do damage first, then apply effects.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
If I had used Muk & Alolan Muk GX's "Severe Poison" attack that places extra Poison damage counters and in the next turn use Koga's Trap, do they still place the extra Poison damage?
No, they don't. The new, normal Poison Special Condition replaces the old Severe Poison Special Condition.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
If I Switch my Active Pokemon that is affected by Poison from Muk & Alolan Muk GX's "Severe Poison" attack and Dust Island is in play, does my new Active Pokemon take the extra damage counters?
Yes, it does. Dust Island specifies that it is affected by "that Special Condition".
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
For Pyukumuku's "Surprise Fist" attack, what happens if Rock-Paper-Scissors ends in a tie?
You have to play R-P-S until there is a winner; you cannot end it in a tie.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
Can I use Venomoth GX's "Ten-Card Return GX" attack if I have no cards in my hand?
Yes, but you must shuffle your deck before drawing cards.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
If one of my Pokemon has the least HP remaining and I use Greninja's "Bring Down" attack, would it Knock Out my own Pokemon?
Yes! And your opponent gets to take the Prize card(s) for it.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
If an Evolution Pokemon has been put directly into play by using Greninja & Zoroark GX's "Dark Union GX" attack can I attach Triple Acceleration Energy to it?
Yes, as long as the Evolution Pokemon says "Evolves from..." on it.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)