Here's some other suggestions:
Make sure you buy Shielded Armor which is sold by the merchant right when you enter the mountain, and use it because it gives you auto Protect, and you need Protect on always since he can hit hard.
If you have a Shell Shield, equip on someone because it gives auto Shell. Have Shell on your other two allies. The boss uses some elemental attacks, and Shell will reduce the damage from those. Give rest of them the best shields possible, and give everyone either a sword or axe/hammer.
Alternatively, you can give your leader a ranged weapon and let him do the healing. You can let him stay as far away as possible from the boss. You can also set one of your melee tanks to give Hi-Potions along.
And most of all, get rid of the other soldiers first using any available AoE attacks you have. Your magic user will be most suitable for this.
As ScottNUMBERS suggested, Gauntlet accessories are very helpful because evasion is very important, esp. when he comboes towards the end. You will likely block more attacks that you would otherwise take damage from.
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