If I use Caterpie's "Pupate" Poke-POWER to successfully evolve into Metapod, can I then immediately use Metapod's "Emerge" Poke-POWER to attempt to evolve into Butterfree, all on the same turn?
Yes, you can.
Source: PUI Rules Team (2008-02-21)
If my opponent has a Pokémon with only 2 damage counters on it, can I still use Absol-EX's "Cursed Eyes" Poké-POWER on it?
Yes, you can. If you use this power, you move the 2 damage counters to another one of your opponent's Pokémon.
Source: Power Keepers FAQ (2007-02-01), PUI Rules Team (2007-02-01)
If my opponent has more than one Pokémon with damage on it, can I use Absol-EX's "Cursed Eyes" Poké-POWER on one that has less than 3 damage counters even if they have another Pokémon with 3 or more damage counters on it?
You may choose to use Absol-EX's power against any Pokémon with damage counters, but if it has less than three you would move all of the damage counters off of it.
Source: PUI Rules Team (2007-02-01)
When using Absol-EX's "Cursed Eyes", do I have to move all three counters or can I choose to move less than three (like if I only need to move one counter to KO another Pokémon and wished to leave the other two where they are)?
You must move 3 from that Pokémon if there are 3 that can be moved.
Source: Power Keepers FAQ (2007-02-01), PUI Rules Team (2007-02-01)
Can you "Energy Trans" or "Dark Trance" a Rainbow Energy, Multi Energy, or any other special energy cards?
As long as they are providing the proper energy type and don't violate any other restrictions written on the card, then yes you may.
Source: PUI Rules Team (2004-05-06), PUI Rules Team (2005-11-17)
If I have Quagsire and my opponent has Ampharos-EX in play and I attach an energy card to my Quagsire from my hand, which Poke-POWER gets applied first, Saturation or Conductivity?
Conductivity and Saturation happen at the same time, so the player attaching energy would get to decide which effect to apply first.
Source: PUI Rules Team (2005-03-03)
Would Flygon's "Energy Shower" attack set off Ampharos-EX's "Conductivity" power? Like if I set down 6 energy, it would do 60 Damage (however I set down the energy)? And if yes, would the damage be done to Flygon or to each separate Pokemon. that I attach an energy to?
Yes, Flygon would indeed trigger Ampharos-EX's Conductivity; it also works the same way for Azumarill's "Drizzle" attack. And the damage would be done to each individual Pokemon that gets an energy attached to it.
Source: PUI Rules Team (2004-01-29)
If Porygon2 has changed a Grass energy to Lightning, would it be fair to say that Venusaur could not Energy Trans it (for the rest of the turn)?
Correct.
Source: WotC Chat (2002-01-17)
If I have 2 of the same Pokémon in play that have a Pokémon Power [or Ability], can I use that power twice? What powers wouldn't be useable twice, or more for that matter?
Sure, depends on the particular power though. If you had two Muks for example, then only one power is necessary.
Source: WotC Chat (2000-05-11)