Can I use Weedle's "Speed Evolution" attack on my first turn of the game or the turn it comes into play?
Yes. An attack can override the normal rules for evolution.
Source: Unleashed FAQ (2010-05-13), PUI Rules Team (2010-05-13)
The damage from Tyranitar's "Power Claw" attack isn't affected by Poke-POWERS, Poke-BODIES, or any other effects on the Defending Pokemon. Would you apply weakness and resistance to its damage?
Yes, weakness or resistance to Tyrantitar's type would be applied where appropriate. These are game rules and not considered effects on the Defending Pokemon.
Source: Unleashed FAQ (2010-05-13), PUI Rules Team (2010-05-13)
Can I use Weedle's "Speed Evolution" attack to search my deck for Beedrill and place it on Weedle?
No, you can't choose Beedrill from the deck. Beedrill states it evolves from Kakuna, so it is not a card that evolves from Weedle.
Source: Unleashed FAQ (2010-05-13), PUI Rules Team (2010-05-13)
Can I use Mantine's "Group Swim" attack to put one half of a Lugia LEGEND card in my hand?
Yes. Either half of the Lugia LEGEND card is still considered "a Water-type Pokemon", so you can search for it with Group Swim.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
If Ariados' "Leech Life" attack does 30 damage but the opponent's Active Pokemon has only 10 HP remaining, how many damage counters will be removed from Ariados?
Leech Life does 30 damage, which is not affected by the fact that the KO only required 10 damage. Therefore, Ariados will remove 3 damage counters, or all if there are less than 3.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
If the Defending Pokemon is currently protected from effects of attacks, do I apply Resistance to Donphan's "Rock Hurl" attack or not?
No, because the phrase "Don't apply Resistance" is part of the damage calculation, not an effect of the attack.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
If the Defending Pokemon doesn't have any Energy cards attached to it, does Typhlosion's "Flare Destroy" attack still require Typhlosion to discard an Energy from itself?
Yes, if the attacking Pokemon has any Energy cards attached, it must discard one of them.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
Can I use Jynx's "Mimic" attack to draw cards from my deck when I don't have any cards in my hand?
Yes, but you must shuffle your deck first before you draw.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
When I use Typhlosion's "Flare Destroy" attack, which player chooses the Energy card to discard from the Defending Pokemon?
The player that used the attack gets to choose which Energy cards get discarded from both the Active and Defending Pokemon.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)
Can I use Jynx's "Mimic" attack to shuffle my hand into my deck when my opponent has no cards in his or her hand?
Yes, but you won't draw any cards after you shuffle it in.
Source: HeartGold & SoulSilver FAQ (2010-02-11), PUI Rules Team (2010-02-11)