If my opponent used Banette's "Evolution Jammer" attack, can I use a Pokemon with the "Delta Evolution" Ancient Trait to evolve anyway?
No, Delta Evolution does not override Evolution Jammer.
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
Both players have 1 prize left. Player-A uses Jirachi's "Doom Desire" attack. Player-B attacks Jirachi with enough damage to KO it with the same Pokemon that got hit by "Doom Desire". Who wins? Or is it a tie?
The KO from Player-B's attack happens before the end of his turn, so the game is over before Doom Desire's effect gets to happen. Player-B wins.
Source: TPCi Rules Team (2015-05-07)
Can I use Close Encounter after my first turn, or only during my very first turn of the game?
You can use it on any turn, including your turn if you go first (when you normally would not be allowed to attack).
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
Banette's "Tool Concealment" ability means Pokemon Tool cards simply have no effect. They are still considered as Items and Pokemon Tool cards, so "Garbotoxin" still works, "Startling Megaphone" would be able to remove them, etc.
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
If Banette's "Tool Concealment" ability is active, can I attach multiple Tool cards to my Pokemon?
No, you cannot.
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
Can I use Rare Candy to evolve a Basic Pokemon into a Stage 2 Pokemon with the "Delta Evolution" Ancient Trait on my first turn or on the Basic Pokemon's first turn in play?
No, you may not.
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
Can I discard a Pokemon with the "Delta Evolution" Ancient Trait to evolve ANY Pokemon in play?
No, that's not how it works. You can only play the Pokemon with the Delta Evolution Ancient Trait on top of a Pokemon it can normally evolve from.
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
Say the "Sky Field" stadium is in play and I have 8 Pokemon on my Bench. My opponent uses Salamence's "Shatter" attack to KO my Active Pokemon and discard the stadium. Do I promote one of my Benched Pokemon first, or do I reduce my bench size to 5 Pokemon before promoting?
When the Sky Field stadium is discarded during the attack, the bench size is reduced immediately before going any farther. So after promoting your new Active Pokemon there will be 4 Pokemon on your Bench.
Source: TPCi Rules Team (2015-04-30)
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)
How many Team Magma/Aqua Pokemon need to be in play in order to attack with Team Magma's Groudon EX or Team Aqua's Kyogre EX with the "Power Saver" ability?
Five. If there are only four or less, it can't attack. But keep in mind that it counts Team Pokemon on both sides of the play field, including itself.
Source: TPCi Rules Team (2015-04-23)