Errata » GUARD
Does Unown G's "GUARD" Poke-POWER prevent effects from attacks that the Unown G is attached to?
No, the Poke-POWER only prevent effects from an opponent's attacks, not your own. Unown-G's "GUARD" Poke-POWER should say, "As long as Unown G is attached to a Pokemon, prevent all effects of attacks, excluding damage, done to that Pokemon by your opponent's Pokemon".
Source: PUI Rules Team (2008-02-21), Organized Play News (2008-02-28)
Errata » Power Whip
Tangrowth's "Power Whip" attack should say, "This attack does 10 damage for each Energy from basic Energy cards attached to Tangrowth to that Pokemon."
Source: Organized Play News (2008-02-28)
Errata » String Bomb
Exeggutor's "String Bomb" attack should say, "Flip a coin for each Energy from basic Energy cards attached to Exeggutor and to the Defending Pokémon."
Source: Organized Play News (2008-02-28)
Errata » Ghost Head
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."
Source: Organized Play News (2008-01-29)
Errata » Energy Shift
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)
Errata » Flame Bluster
Magmortar LV.X's "Flame Bluster" attack should say "discard 2 Fire Energy CARDS" rather than just "discard 2 Fire Energy".
Source: Organized Play News (2007-11-16)
Errata » Discharge
Electivire's "Discharge" attack should say "for each Electric Energy CARD" rather than just "for each Electric Energy".
Source: Organized Play News (2007-11-16)
Errata » Blaze Roar
Entei's "Blaze Roar" attack should say "discard 2 Fire Energy CARDS" rather than just "discard 2 Fire Energy".
Source: Organized Play News (2007-11-16)
Errata » Supreme Command
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.
Source: PUI Announcement (2007-05-25)
Errata » Holon Energy WP | Errata » Ice Generator
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.
Source: PUI Announcement (2006-07-25)