I plan to train a crobat myself.. as soon as I can find two golbats with screech...

Anyways, instead of sludgebomb and toxic, you could have poison fang. IT is a 50-power move with like 30% chance of TOXIC

you could also go for an attacking crobat

Sludgebomb/Poison Fang
Air Cutter/Wing Attack
Confuse Ray
screech/filler

I"m not good with movesets, but it looks liek it COULD work...

Also.. did the move MIST change effect? it seem slike it prevents stat reduction.. is that any good....?