Has anyone defeated the final boss of Chrono Trigger? *SPOILERS*

I don't think I even know what the final stage of Lavos happens to be.

I'm picking this game up after a year and a half from when I was bored with it the first time.

I really don't want to start a new game but at the same time I don't know what the heck I'm supposed to do. My party is already in its 70's so I was hoping I could just defeat Lavos and start a New Game+

But boy was I wrong. Lavos is just too strong near the end, and I don't know what strategy to use to defeat the damn beast once and for all.

Could anyone recommend me their party moves and setup to finally defeat the guy? Is my level too low? Type of equipment?

I'd appreciate the responses.

You can't use a strategy guide somewhere? I think the 70s is high enough to defeat Lavos.

Yes, I beat him on the PS1 version.

My team was Crono, Robo and Magus.

Crono spammed...something, Robo kept healing and Magus spammed Dark Matter or whatever it was.

I was lvl 52.

Magus can solo Lavos at around 60, thats when I did it, that was fun.Allicrombie

Chrono Trigger's one of the easiest RPGS I've ever played.

Just spam Chrono's last spell while healing.

I've beat lavos at lv 45 with Chrono, Frog and Robo. It isn't hard once you figure out which things kill first.

Which form exactly you're having problems with?