this strategy is based on using a fossil gengar and the sabrina's gengar with pain amplifier.  First do damage with some other pokemon or with sbrina's gengar.  Then use gengar's curse to move that damage around.  once damage is spread around use Sabrina's gengar's pain amplifier to do 10 more damage to every pokemon with damage on it of your opponents.  Then you can bring in Fossil gengar and dark mind to spread damage around even more.  by the time that both gengar's are knocked out you should have another pokemon and it should be able take care of all of your opponents weakened pokemon.  
 
elian_g_@hotmail.com    ScottA