Can I use a regular attack and Aqua Diffuser/Magma Pointer as well, for a total of two attacks on the same turn?
No, you cannot. The text just means that you also have this attack available as a choice for your one attack for the turn.
Source: TPCi Rules Team (2015-04-23)
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 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)
If I play Repeat Ball and I have Kyogre in play, can I search for a Kyogre EX card?
No. The name has to be exactly the same.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
Does "Silent Lab" stadium shut off "Alpha" and "Omega" abilities?
No, those are considered Ancient Traits, they are not Abilities.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
Can I use "Teammates" if my Pokemon was KO'd due to Poison damage?
No, you cannot. You can only use Teammates if your Pokemon was KO'd *during* your opponent's last turn, but Poison damage takes place *in between* turns.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
If I use "Archie's Ace in the Hole" or "Maxie's Hidden Ball Trick" to put a Mega Pokemon or Primal Reversion directly onto my bench, does my turn end?
No, it does not. The Mega and Primal Reversion rules say your turn ends "when one of your Pokemon becomes" that way.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)
If my opponent KO's my Active "Robo Substitute", would I get the extra benefits from Terrakion's "Retaliate" Attack or Toxicroak's "Revenge" Attack?
Yes, you would. Even though Robo Substitute does not give up a prize card, it still counts as a KO'd Pokemon.
Source: TPCi Rules Team (2014-12-04)