Oh, man. I feel you there. I was stuck on this for a very long time, but I got through it by pure luck.
When most people have these kinds of problems, they usually go all out on items. I suggest using Complexity -1, Mega Start, Disruption Delay, Attack Power Plus (optional) and Moves +5 (optional). They usually get you through any stage without much problems, but you'll have to use them together at one time.
Hope I helped!