a very good question, and one i cannot answer. First of all that was soooo frckn dumb of me sending in gengar when a bullet punch was an obvious ohko.
Ok well my reasoning was, i needed crobat as a lead and weezing i needed to take out scizor (sorry ive been watching your videos and i KNEW that a scizor would be there, i just knew it, its always a pain in my side and i needed that), and nidoqueen was there for a good second lead. The final poison slot went down to between toxicroak, gengar, and muk. Toxicroak because its pretty amazing and acctually helps alot mostve the time, muk just because hes a beast, but i went with gengar, cause i thought i could try a perish song to force you to switch anything you had set up, but like an idiot, i decided HEY ill send it in on a scizor >.>.... anyways muk woulda been a big help but still woulda been anihalated by dug.