Banette is receiving errata for its first attack, Ghost Head. Ghost Head can't cause Banette to Knock Out itself ... the attack has to leave Banette with at least 10 HP. "Put as many damage counters as you like on Banette. (You can't Knock Out Banette.) Put that many damage counters on the Defending Pokémon."
Electrode is receiving errata for the card to reflect that its Poké-Power can trigger when any attack Knocks Out Electrode, not just during its owner's turn. "If Electrode would be Knocked Out by damage from an attack, you may use this power. Electrode isn't discarded. Instead, attach it as an Energy card to 1 of your Pokémon. While attached, this card is a Special Energy card and provides every type of Energy but provides only 1 Energy at a time. (Has no effect other than providing Energy.)"
Source:
PUI Rules Team (2007-12-06), Organized Play News (2008-01-29)
Empoleon LV.X from Diamond & Pearl contains an error. Its Poké-POWER symbol was printed with the Poké-Body symbol. In all cases, play Empoleon's effect as a Poké-Power. The game play of the effect remains unchanged.
Holon Energy WP and Ancient Technical Machine [Ice] only prevent effects that come from attacks, not all effects in play. Trainer cards, Poké-Powers, and Poké-Bodies are not prevented by those cards.
Blastoise-EX and Articuno-EX each have an attack that discards an Energy card from the Defending Pokémon. The player using those attacks is also the player who chooses the Energy card to be discarded.
The Poké-BODY "Knockout Gas" found on Koffing should read, "If Koffing is your Active Pokémon and is Knocked Out by damage from an opponent's attack, the Attacking Pokémon is now Confused and Poisoned." So only attacks that do damage (not "place counters") would cause Knockout Gas to be invoked.