x2Darkness Guard
As long as Rocket's Zapdos ex has any Darkness Energy attached to it, damage done to Rocket's Zapdos ex by an opponent's attack is reduced by 10 (after applying Weakness and Resistance).
PlasmaSearch your discard pile for a Lightning Energy card and attach it to Rocket's Zapdos ex.
Raging ThunderThis attack does 30 damage to 1 of your Pokémon.
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
If I use Rhyperior V's "Drill Run" attack against a Darkrai with "Darkness Guard" Ability and only one Darkness Energy card attached, does Darkrai take 20 less damage before discarding the Darkness Energy or is the energy card discarded before the damage is reduced?
If an attack discards energy from the Defending Pokemon, the damage reduction happens first and then apply any attack effects.
Sky Pillar says, "Prevent all effects of the opponent's attacks, including damage, done to Benched Pokemon (both yours and your opponent's)". So does this mean if I use an attack like Zapdos' "Raging Thunder" that I do not apply the bench damage to my own Pokemon?
No, only bench damage done from an opponent's attacks is prevented by Sky Pillar. If your attack does damage to your own Benched Pokemon it is not prevented.