If Weezing has 10 HP left and is Poisoned, would it be Knocked Out before its "Detention Gas" Ability takes place?
No. Even if a Pokemon receives more damage counters from Special Conditions, Abilities, etc. than its remaining HP, that Pokemon isn't Knocked Out until "between turns" is over.
Source: TPCi Rules Team (2019-06-06)
Can I use Lycanroc-GX's "Bloodthirsty Eyes to target an opponent's Pokemon with Stealthy Hood attached?
Bloodthirsty Eyes can target a Benched Pokemon with Stealthy Hood attached, but its effect would be immediately blocked. However, if the Pokemon with Stealthy Hood is Active, Bloodthirsty Eyes can target a Benched Pokemon without a Stealthy Hood and the switch would take place.
Source: TPCi Rules Team (2019-05-30)
Can a Pokemon with an attack that does damage to the opponent's Bench get through Mr. Mime's "Bench Barrier" Ability if the Attacking Pokemon has Stealthy Hood attached?
No, it does not get through. The Bench Barrier Ability is not "being done" to the Attacking Pokemon.
Source: TPCi Rules Team (2019-05-30)
Prior to the "Black & White" series, when a Pokemon refers to itself by name, interpret that card as though the text reads "this Pokemon". This has the practical effect of not including other Pokemon of the same name; if a Pokemon copies that text, it refers to itself, not the original Pokemon. Beginning with "Black & White", when a Pokemon refers to itself by name, this extends to other Pokemon of the same name; if a Pokemon copies that text, it refers to other Pokemon of the same name. Also, when a Pokemon refers to "this Pokemon", this has the practical effect of not including other Pokemon of the same name; if a Pokemon copies that text it refers to itself, not the original Pokemon.
Source: PUI Rules Team (2008-04-17), TPCi Rules Team (2019-05-16)
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 use Welder and attach a Fire Energy to an Eevee that has the "Energy Evolution" Ability, do I draw the cards for Welder first or search for a Flareon due to "Energy Evolution" first (or is it a choice)?
Since they are simultaneous actions, it is the player's choice of which order they can do this.
Source: TPCi Rules Team (2019-05-09)
Can I use Welder if there are no Fire Energy cards in my hand?
No, you cannot. You must be able to attach at least 1 Fire Energy card in order to use Welder.
Source: TPCi Rules Team (2019-05-09)
Does Martial Arts Dojo stadium's +40 more damage apply to Benched Pokemon?
Although the secondary effect is missing the "to the opponent's Active Pokemon" phrase, the intent is for the +40 more damage to only apply to the opponent's Active Pokemon.
Source: TPCi Rules Team (2019-05-09)
If I play Lt. Surge's Strategy first, can I then play a second (or third) Lt. Surge's Strategy to play more than 3 Supporters?
Nope, that doesn't work. The second Lt. Surge's Strategy does not add to the number of additional Supporter cards you can play, so you can't play the second one at all because you cannot play Trainer cards for no effect.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-09)
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)