The Metal Zone on the world map has metal monsters that can be hunted for lots of experience. The monsters here will spend most of the battle running around. If you take too long to defeat them, they will escape. Try to force them into a corner with your own characters and damage them as fast as possible. This zone is only open sporadically, so check often for its availability. The Hunting Zones contain rare items and include some needed to unlock new jobs for your characters. The types of Hunting Zones and their rewards change daily.