The wording of Exeggcute's "Multiply" attack is a little ambiguous. Does it mean you can only search for one Exeggcute, or as many Exeggcute as you want?
Just one.
Source: Forbidden Light FAQ (2018-04-20), TPCi Rules Team (2018-05-03)
If my opponent used Zoroark's "Foul Play" attack their previous turn, could I play Guzma to bring up a benched Pokemon and have Sudowoodo's "Watch and Learn" attack use "Foul Play" to copy one of the new Defending Pokemon's attcks?
Yep, that works.
Source: TPCi Rules Team (2018-03-01)
What happens if my opponent failed a Confusion check last turn and I try to use Sudowoodo's "Watch and Learn" attack? Would Sudowoodo take 3 damage counters?
If the Pokemon failed its attack because of Confused, an attack was not used. Sudowoodo's Watch and Learn would simply do nothing.
Source: TPCi Rules Team (2018-03-01)
If I use Sudowoodo's "Watch and Learn" attack on the turn after my opponent's Mew EX used its "Versatile" Ability, can "Watch and Learn" copy the attack that Mew EX used?
Yes, that works.
Source: TPCi Rules Team (2018-02-15)
Can I choose to move less than 4 damage counters on one or more of my Pokemon when using Drifblim's "Damage Transport" Attack? Or can I choose to skip any of my Pokemon?
No, if you have 4 or fewer damage counters on any of your Pokemon you must move them.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
What happens during Drifblim's "Damage Transport" Attack if I have less than 4 damage counters on one or more of my Pokemon?
If there are 4 or less damage counters on one of your Pokemon you must move all of them.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
If my opponent has no benched Pokemon, does the current Active Pokemon become poisoned if I attack with Roserade's "Inviting Poison"?
No, it does not become poisoned. If there's no switch to the bench there's no "new Active Pokemon" to become poisoned.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
After time is called at the end of a match, what happens if I use Dialga GX's "Timeless GX" attack during the "plus three turns" part?
If you use Timeless GX when time is called during your turn, you would then get "Turn 1" instead of your opponent. Likewise, if you use it during Turn 1 you would also get Turn 2 and your opponent would get Turn 3, and so on... However, if you use it on the final turn of the match you do not get an extra turn.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
When you use Dialga GX's "Timeless GX" attack does Poison still happen in between turns?
Nope, the attack says to "skip the between-turns step", so Asleep, Poisoned, Burned, and any other between turn effects also get skipped."
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)
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)