My team is P4MC/Kanji/Chie in front, Naoto/Reizen in back. Everyone is just about at Lv 9 with Naoto at 6 since I switched her out later from hearing good things in here.
What's weird is that sometimes, the battles AREN'T BAD. Like right now, I got lucky with being able to stun them. But then another time, it goes awful. I guess it's based on luck....
Do you have any debuffing moves? MiguelMexMistery mentioned Tarunda and Poisma, but there are also skills like Disarm and Pulinpa which you can also use to make the battle easier. You could always spend a turn defending with everyone but the person you're using to debuff lol. When I first fought the beetle the only way I'd survive was by ending all of my turns with Sleeper Punch and defending with the characters that might wake him up. :<