Zack will encounter three foes at once in this fight. The player should focus on defeating one of them at a time. Magic attacks will inflict heavy damage on the machines, but standard sword attacks or critical hits will work as well.
Zack should equip any accessories that will nullify Poison status to guard Zack against the Shot Machine's Poison Gas. Nevertheless, high Magic stats and Thunder Materia will be the best way to achieve quick victory.