Three cards have been added to the list of errata for the Pokémon Trading Card Game. [...] The text below reflects what the card should say, not what was originally printed. "When you attach an Energy card from your hand to Onix, remove a damage counter from Onix." This Poké-Body only works when you attach an Energy card to Onix.
Source: PUI Rules Team (2010-05-06), TPCi Errata Update (2010-05-07)
Do I need to have a current version of "Moomoo Milk" outside my deck if I'm playing the older versions of the card in Modified Format?
Technically speaking the "Heart Gold/Soul Silver" version is a different card and it does not do the same thing as the older versions used to (it removes more damage counters now). So you cannot play "Moo-Moo Milk" from "Neo Genesis" nor "Expedition" in the current 2009-2010 Modified Format.
Source: PUI Rules Team (2010-02-18)
How do we play Team Galactic's Wager in Team Battle, when it says, "Each player shuffles..."?
For this card, treat the text "each player" like "you and your opponent". Under POP team play rules, this means: pick someone on your team and someone on the other team. Then only each of those players shuffle their hand, etc.
Source: PUI Rules Team (2010-02-18)
If Primeape's "Top Drop" attack reveals a LEGEND Pokemon card with no HP printed on it, how much damage does it do (if any)?
No damage is done regardless of which LEGEND half is revealed by Top Drop, because even the half with HP written on it is not considered "a Pokemon" while in the Discard Pile.
Source: PUI Rules Team (2010-02-04), PUI Rules Team (2010-02-18)
Can I use Mew's "Re-creation" attack to choose a Lugia LEGEND card with the attack "Elemental Blast" written on it from my opponent's discard pile, and use that attack?
No, you can't use any attacks from a Pokemon LEGEND unless both pieces are in play.
Source: PUI Rules Team (2010-02-18)
Can I use "Pokemon Collector" to choose Pokemon LEGEND cards as part of the 3 Basic Pokemon I search for in my deck?
No, because Pokemon Collector only lets you choose Basic Pokemon. Pokemon LEGEND are considered "Unevolved Pokemon" when in play, but they are not considered "Basic Pokemon".
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
Can I use cards that search for a Pokemon, like "Bebe's Search" or "Poke Ball" to get a Pokemon LEGEND card from my deck?
Any effect that lets you search your deck or discard pile or do something from your hand with "a Pokemon" will let you use that effect on one half of a Pokemon LEGEND set, but not both halves.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
When I use the Supporter "Fisherman," can I put less than 4 Basic Energy cards from my discard pile into my hand?
If you have 4 or more Basic Energy cards in the discard pile you must put exactly 4 of them into your hand. But if there are less than 4 Basic Energy cards in the discard pile, you must take them all.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
Can I use the Supporter "Copycat" when my opponent has no cards in his or her hand?
Yes, you can. Shuffle your hand into your deck, but don't draw any cards.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
Can I play the Supporter "Copycat" when it's the only card in my hand?
Yes, you can. Shuffle your deck, then draw cards equal to the number of cards in your opponent's hand.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)