They gave me a tough time to, loco weeds, fire fangs, and bolt plumes help here. Yes they do get many more attacks than you, so watch out. Do not let the one that casts berserk berserk you, and make sure hews confused so he winds up berserking one of his party members instead.
First take out the Curing one, I believe hes the purple one, because he will cure and revive the other members ALL the time.
Next concentrate on the blue one, this guy can deal some serious damage, especially if he's berserked.
The other one sucks, and just does some sort of kill move when he dies, watch out for it.
Go up 2 floors although you cannot unlike the doors and fight the fights that have Soldiers and Robots. You can steal a Hardedge from these soldiers that may help you a good bit,I forgot what the robots steal was.Lvl up here until you feel confortable(fire fangs and bolt plumes come in handy on the lvling as well)head back down and save, and then give em your all.