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Answer from: Amitakartok
Arm all of your party members with the best equipment you can buy at this point: Beam Pick or Tomahawk for the main character, Bazooka or Guncannon for Fritz and Aeon. During the battle itself, use Defend whenever he uses a Boost Attack; if you don't, he will inflict a tremendous amount of damage and will likely wipe out the entire party.
If he's not preparing for a Boost Attack, hit him with everything you've got. The Zock, being a mobile armor, cannot retaliate against melee attacks so let him have it.
If you're not sure you can take him, grind in random encounters and level up first. One suggested grinding location is the interior of the Mega G System north of Eisengrad.