Once you have declared an attack, you cannot leave the attack step without your opponent's permission. If you declare an "illegal" attack (e.g., you don't have the proper energy required to perform the attack), you may ask your opponent's permission to back out of the attack step. If he or she says "yes", you can go back and take any actions that you could have taken prior to the attack step. If he or she says "no", you may either select an attack that is legal or you may pass.
Source:
Organized Play Announcement (2007-03-14), PUI Rules Team (2007-03-15)
If an attack has an *optional* effect triggered by a discard, a Pokémon copying that attack must be able to do that discard in order to get the additional effect; if they cannot perform the optional discard, it still gets the base effect and damage.
Damage effects applied by the attacker (i.e. Nidoking's "Power Gene" adding +10 to Nidoqueen) are handled before weakness and resistance. Damage effects applied by the Defending Pokémon are handled after weakness and resistance.
I've noticed that some cards say "Does 10 damage to the Defending Pokémon", whereas others say "Put 1 damage counter on the defending Pokémon". Is there any reason for the different wording? I've spoken to someone who says that you do not apply weakness or resistance for attacks where it specifies Damage Counters; is this the case?
There is a difference. As you mention, weakness and resistance are not applied when placing counters. Also, things like Defender and Metal Energy will not block Placing Damage Counters. It will not trigger things like Base Set Machamp's Strike Back. In the steps of resolving an Attack, "placing Damage Counters" counts as an Effect of the attack, it is not part of "doing damage".
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.]
It has been ruled that W/R does not apply to the bench unless specifically mandated by the card. Period. That is a meta-game rule. It was never intended that the W/R would apply to the bench unless specifically stated. Yes we do know that some Pokemon say not to apply W/R to the Bench. [But] if it doesn't say then you wouldn't apply Weakness and Resistance (the default for benched Pokemon is to NOT apply Weakness and Resistance). This has been verified.
Say you are using a Golduck (from the Fossil set) and you use his Psybeam. Would this be a Psychic or Water attack?
A Water attack as Psyduck is a Water Pokémon. [Ed. Note: This answer can be generalized further: When a Pokémon attacks, that attack is considered to be an attack of that Pokémon's type; it's not dependent on the energy requirement.]
When a card's attack "does damage to itself", is this damage considered to be an ATTACK against the Defending Pokémon? Let's say you had an Electabuzz versus a Team Rocket Porygon and Team Rocket Porygon switched Electabuzz's Weakness to Lightning. You Thunderpunched with Electabuzz and flipped tails. Would Electabuzz receive 10 or 20 damage? Furthermore, would Defender prevent this damage? (Defender prevents damage from attacks).
1) 20, it is considered an attack.
2) Well, assuming it was an attack that did damage to itself, then Defender would help with that damage.
