Attacks » Smokescreen
Does Magmar's Smokescreen effect end if the Defending Pokémon evolves?
Since Magmar's Smokescreen attack references the Defending Pokémon, by it evolving, it removes that effect.
Source: WotC Chat (2000-02-03)
Attacks » Agility
Does Fearow's Agility attack block Kangaskhan's Fetch?
Actually it does not; Fearow's Agility says stops damage done to Fearow, and the Fetch just draws a card. This is the new ruling from R&D.
Source: WotC Chat (2000-02-03)
Attacks » *Attacks in General
Do you have to attack if you have enough Energy cards attached to your Pokémon?
No, you always have the choice whether to attack on your turn or not.
Source: WotC Chat (2000-01-27)
Attacks » *Attacks in General
Can I attack with a Pokémon if I just played it?
Yes, as long as it's your Active Pokémon (only your Active Pokémon can attack) and as long as it has the required amount of Energy for the attack.
Source: WotC Chat (1999-09-30)
Attacks » Leech Life
If I attack with Venonat's Leech Life and do 10 damage, how many damage counters do I remove from Venonat?
You remove one damage counter, which equals 10 damage.
Source: WotC Chat (1999-09-30)
Attacks » *Attacks in General
When I attack, do I discard the Energy card(s) I used to power the attack?
Energy is not used up by an attack. Unless that attack specifically says to discard an Energy, it stays attached to the Pokémon.
Source: WotC Chat (1999-09-30)