Quote Originally Posted by ReloadPsi View Post

Don't use Lightning or physical attacks. That's like the absolute worst thing you can do to that boss because they automatically counter every single attack with something based on what you hit them with, and their Light and Physical counters are by far the strongest. What you really wanna do is have Lucca hit them with her strongest all-hitting spell and have Crono and Marle spam Aura Whirl. It's a bit of a crap healing tech but considering how little damage their Fire counter does you should be fine.
I beat them last time with that strategy I mentioned before though... But this time I changed the strategy. I started the battle with Lightning2, spammed Arc Impulse (1900 damage per hit), and cast Double Cure when my party was around 200-300 HP, that worked nicely.

So, now on-topic: played Chrono Trigger all day, made it quite far. Only 3-4 sidequests to do, then it is time for Lavos!