Chrono Trigger DS - Melphyx
Be sure to have your character to attack and your healer (Crono and Frog) equipped with Black Vests you can get from the "Mysterous Chests" around the different eras.
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Anyways, be sure that atleast one character in your party has Ice or Ice II, I used Magus for this.
If you did the same as me and went for the chests before the battle be sure to Heal since his Earthquakes have probably done some damage to you.
As soon as the battle starts, swarm his core with normal attacks until it´s destroyed, then Cast Ice II to lower his defenses and then use Crono´s Frenzy Tech, keep doing this while casting Ice II every so often and, of course, use Frog´s Heal when needed.
After his Upper Part gets destroyed go for his Lower Part, but remember his Chomp sucks a pretty big amount of HP.
The reason why the Black Vests are needed is to gain some HP from his Dark Spin and Dark Flare Techs of the upper body, that way the battle is somewhat easier.
Good luck!
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