If my Active Pokemon evolves into Lucario and uses its "Stance" Ability, does its effect get cleared if it moves to the Bench?
No, its effect remains.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
Can I play "Acerola" to return a damaged Pokemon and all cards attached to it to my hand when Lunatone's "Heal Block" ability is activated?
Yes, you can return the Pokemon and attached cards to your hand.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
Can you use Dusknoir's "Dark Invitation" Ability if your opponent's Bench is full?
No, you may not. It's public knowledge that you can't put down any additional Basic Pokemon on your opponent's Bench, so you cannot use the Ability.
Source: TPCi Rules Team (2017-08-03)
If I have a Solrock in play so that Lunatone's "Heal Block" ability is activated, does it apply to all Pokemon in play or just the two active Pokemon?
It applies to all Pokemon in play.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
If I put a Charizard GX in play using Ho Oh GX's "Eternal Flame GX" attack, and my opponent evolves into Porygon-Z and uses its "Initialize" Ability, does Charizard GX go back into my hand?
No. Charizard GX is in play as an "unevolved Pokemon" and so is not affected by the Ability.
Source: Burning Shadows FAQ (2017-07-20), TPCi Rules Team (2017-08-03)
When using Tapu Koko GX's "Aero Trail" Ability, can I choose to move zero energy cards and switch it with the Active Pokemon?
No, you may not. It says if you do move energy, and moving "zero energy" is not moving energy; therefore you do not get to switch Tapu Koko GX with your Active Pokemon.
Source: TPCi Rules Team (2017-07-06)
Does Machoke's "Daunting Pose" Ability prevent my opponent's Decidueye GX's "Feather Arrow" Ability from placing damage counters on my benched Pokemon?
Yes it does. Decidueye GX can still use the ability against one of your benched Pokemon, but placing any damage counters would be blocked.
Source: TPCi Rules Team (2017-06-01)
My opponent and I both have Sudowoodo with "Roadblock"Ability in play. I use Hex Maniac on my turn to shut off "Roadblock", and then I play 5 Pokemon on my Bench. My opponent plays 5 Pokemon on their Bench during their turn. At the end of my opponent's turn, Hex Maniac's effect ends, so "Roadblock" activates again. Who discards their Pokemon first? If the first player discards their Sudowoodo, would the other person need to discard a Benched Pokemon?
It's the opponent's turn, so their Roadblock goes into effect first. You would discard your Pokemon first, and then your opponent would discard theirs. Even if you chose to discard your Sudowoodo, your opponent would have to discard down to 4 Benched Pokémon because the Roadblock effects happen simultaneously.
Source: TPCi Rules Team (2017-05-25)
If Vileplume's "Allergy Panic" Ability is in effect, does Rayquaza's "Shred" attack consider a Defending Pokemon's weakness as x2 or x4?
Shred isn't affected by "any effects on the Defending Pokemon", but the term "any effects" does not include effects that alter Weakness or Resistance. So in this case the Defending Pokemon's Weakness would be x4 due to Allergy Panic.
Source: TPCi Rules Team (2013-02-28), TPCi Rules Changes Announcement (2017-05-03), TPCi Rules Changes Announcement (2017-05-18)
Altaria has a printed weakness to Lightning, but it also has the "Clear Humming" Ability which creates an effect that gives it no weakness. What happens if it is attacked by Zebstrika with the "Zap Zone" Ability which makes its attack's damage ignore effects on the defending Pokemon? When Zebstrika attacks Altaria, is the damage altered by weakness or not?
Zap Zone refers to "any effects on your opponent's Active Pokemon", but the term "any effects" does not include effects that alter Weakness or Resistance. So in this case Zebstrika's attack will NOT be increased for Weakness, due to Clear Humming.
Source: TPCi Rules Team (2016-03-24), TPCi Rules Changes Announcement (2017-05-03), TPCi Rules Changes Announcement (2017-05-18)