Hm.. interesting team. Mainly, I would lead Qulliava to pretty much destroy all of her Grass types, and for her Cradily, send out Makuhita. I think you can also Mime Jr. on her Foongus if it has a STAB Psychic move. Also, hopefully you're team is around the 20s so it'll be more easier for you.
EDIT: Sorry Phlytosion :] and whoops, forgot she switched Foongus to Maractus, shows how long its been since I faced her. Also, you can go buy Super Potions from a Vendor infront of the healing spot inside the school. If you have the cash for it.