Can I play Sophocles and discard two cards if there are no cards left in my deck?
No, you cannot. Discarding the two cards is a cost not the effect, and you cannot play Trainer cards for no effect.
Source: TPCi Rules Team (2019-03-21)
Can I play Fiery Flint and discard two cards if there are no cards left in my deck?
No, you cannot. Discarding the two cards is a cost not the effect, and you cannot play Trainer cards for no effect.
Source: TPCi Rules Team (2019-03-21)
When using Ingo & Emmet, if I choose to draw 5 cards from the bottom or my deck, what happens to the top card that I looked at?
You put it back on top before you draw the 5 cards from the bottom.
Source: Team Up FAQ (2019-01-18), TPCi Rules Team (2019-01-31)
If I use Judge Whistle and choose to put a "Judge" card from my discard pile into my hand, can I put a "Judge Whistle" into my hand?
No, that choice only allows you to put a card named "Judge" into your hand; it does not allow you to get a card "with Judge in its name".
Source: Team Up FAQ (2019-01-18), TPCi Rules Team (2019-01-31)
Can I play Lost Blender if I only have one card in my hand to put into the Lost Zone?
No, you cannot play Lost Blender unless you put 2 cards from your hand in the Lost Zone.
Source: TPCi Rules Team (2019-01-03)
If Klefki with the "Wonder Lock" Ability is attached to a Pokemon as a Tool card, what happens if "Silent Lab" stadium comes into play? Does "Wonder Lock" shut off and Klefki get discarded, or does it remain attached to the Pokemon?
Once Klefki is attached as a Pokemon Tool card it retains its effect even when its Ability has been disabled. Once it's attached, it is essentially treated as a Tool with that text, so shutting off its Ability doesn't matter at that point. However, if something such as Lysandre Labs is in effect, Klefki won't be discarded at the end of your opponent's turn.
Source: TPCi Rules Team (2019-01-03)
When I have seven cards in my hand, can I discard only one with "Sightseer"?
No, you cannot. You must discard until your hand has 4 or fewer cards when using Sightseer.
Source: TPCi Rules Team (2018-12-06)
If I use Sylveon's "Wink Wink" attack to have my opponent discard Ilima, can I use Victini's "Victory Star" Ability to force my opponent to re-flip their coins?
Yes, you can. If your opponent flips a coin as part of your Pokemon's attack, you can use "Victory Star" to force them to re-flip those coins; but keep in mind you will have to re-flip your coins for Ilima too.
Source: TPCi Rules Team (2018-11-15)
If my opponent used Gardevoir EX's "Shining Wind" attack to gain "no Weakness" and I play Pokemon Ranger when it is my turn, does their Gardevoir EX have a Weakness again?
Yes. The ruling about effects on Weakness and Resistance not being ignored has to do with damage calculations [see "General Gameplay -> Weakness and Resistance" section for reference], not about whether a Pokemon HAS Weakness or Resistance. Pokemon Ranger removes attack effects, including this one; so yes, Gardevoir EX would have Weakness again after using Pokemon Ranger.
Source: TPCi Rules Team (2018-11-15)
Is there any way to clear the effect of Lusamine {*}?
No, however any attacks that ignore effects on the Defending Pokemon would get through its effect.
Source: Lost Thunder FAQ (2018-10-20), TPCi Rules Team (2018-11-01)