I think you should be able to do it. I'd maybe line them up like this:
1. Venusaur
2. Victreebel
3. Groudon
4. Sceptile
5. Shiftry
6. Vileplume
I doubt if you'll even get to the Vileplume, which is the weakest team member IMO. My daughter used a SoB Groudon against Omastar the other day, and it survived long enough to launch four solar beams.