If my opponent's Active Pokemon has the "Omega Barrier" Ancient Trait, can I use Lysandre to switch one of my benched Pokemon with it?
If your opponent's Benched Pokemon has "Omega Barrier", then Lysandre's effect will be blocked. But choosing a Benched Pokemon without "Omega Barrier" will cause it to switch with the Active Pokemon because the Benched Pokemon is the target of Lysandre.
Source: TPCi Rules Team (2015-04-09)
If I attack using a Pokemon that has the "Omega Barrage" Ancient Trait, can I do things like attach an Energy or play a Trainer between attacks?
No, you would resolve all effects from the first attack and then either perform your second attack or pass. You don't get to go back into the main part of your turn again.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
If I only have one energy card attached to Excadrill, can I use its "Omega Barrage" to attack with "Dredge" first to attach two energy cards, then attack a second time with "Mach Claw"?
Yes, that would work.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
What happens for Omega Barrage if the Pokemon is Confused?
You need to flip for Confusion twice if you choose to attack twice. One flip for the first attack, then flip again if you decide to attack again.
Source: TPCi Rules Team (2015-02-05)
If I use Escape Rope but my opponent's Active Pokemon has the "Omega Barrier" Ancient Trait does he or she have to switch it? Or if they have a Pokemon with "Omega Barrier" on the bench can he or she choose that and not switch it to Active?
If your opponent has an Active Pokemon with "Omega Barrier", then Escape Rope's effect will be blocked. If a Pokemon with "Omega Barrier" is on the bench, choosing that Pokemon will not stop the effect as the Active was the target of Escape Rope.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
Can I attach a Team Flare "Pokemon Tool F" card to my opponent's Pokemon-EX if it has the "Omega Barrier" Ancient Trait?
Yes, you can. The text of Omega Barrier says its effect excludes Pokemon Tools and Stadium cards.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
Can I use Sceptile's "Nurture and Heal" ability to attach a {G} Energy to a Pokemon that doesn't have any damage on it?
Yes, you can.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
If I use Sceptile's "Nurture and Heal" ability, is that an extra Energy card attachment or does it count as my one attachment for the turn?
It is an extra Energy attachment. You still get to attach one other Energy card as your normal attachment for the turn.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
What happens if Mew EX uses its "Versatile" ability to copy Xerneas EX's "X Blast" attack? Can it use "X Blast" again the following turn or not?
When Mew EX attacks, Versatile uses the attack name specified. So when it attacks with X Blast, Mew EX cannot use that attack twice in a row.
Source: TPCi Rules Team (2015-02-05)
Are Omega and Alpha effects considered Abilities? Will things that affect Abilities affect them too?
They are neither Attacks nor Abilities. They are something different called "Ancient Traits". Effects that apply to Attacks or Abilities don't apply to Ancient Traits.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)