When you play a Warp Point in Team Multiplay, how does it work?
Play the card as written. The player who uses the card gets to decide which opponent it affects and which member of his or her team it affects. Each of those players gets to choose which Pokemon they switch up from their own bench.
Source: WotC Rules Team Update (2002-09-16)
When the text for a previously released card changes in a new set, how are the older cards played?
You will need to start using the new text as soon as the set is released.
Source: WotC Chat (2002-09-05)
When using Agility in Team Play, can you specify which of the opposing team's Active Pokemon is affected by the Agility effect, or does it HAVE to be the Defending Pokemon that you are attacking with Agility?
It does have a you or your in it, so you would be able to select which opponent's active Pokemon it affects.
Source: WotC Chat (2002-07-18)
In Team Battle, can I use my Venusaur to switch Grass Energy between my teammate's Pokemon (not moving them between owners)?
Yes.
Source: WotC Chat (2002-06-27)
In Team Play, when an attack like Kakuna's "Secrete Poison" or "Agility" specifies the phrase "during your opponent's next turn", does that count for both opponents or do you have to choose one of the opponents to have the effect during their turn only?
You would have to specify which opponent.
Source: WotC Chat (2002-05-23)
ANY Pokemon attack or Power that can only be used once per turn, is reset if that Pokemon evolves or devolves or leaves play and that power or attack could be used again if that Pokemon came into play again that same turn. The "can't use this attack next turn" sets up a status effect that can be ended through the normal means: benching, leaving play, evolving or devolving. With Pokemon Powers though, you can't get around the once per turn by benching. Benching a Pokemon does NOT get around these effects as they are still the same Pokemon and still in play. [Ed.Note: This does not apply to Tentacool Lv.10 (Fossil) which specifically states in the text of the power that it cannot be used on the same turn it comes into play.]
Source: WotC Chat (2001-09-27), WotC Chat (2002-02-14), WotC Chat (2002-05-23)
Can Pokemon be Knocked Out partway through completing the Trainer card?
A Pokemon cannot be Knocked Out partway through the Trainer card. You must complete all of the actions of a Trainer card BEFORE you check for game state checks (to see if a Pokemon is Knocked out for example).
Source: WotC Chat (2002-03-06), WotC Chat (2002-03-07)
A Special Energy Card remains a Special Energy card regardless of what happens to it. A Fire Burned Rainbow Energy may only produce Fire energy but it would still be considered a Special Energy card as well.
Source: WotC Chat (2002-02-14)
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 an attack says to discard a specific type of Energy card to use that attack, can a Rainbow Energy be used to pay that cost?
Yes, you can.
Source: WotC Chat (2001-10-11)