Dragon's Den... It's gonna happen

As in Zone Seeker Are you referring to the Zone Eater in Triangle Island?
If you are, this can easily done. The Zone Eater has the spell Engulf, this spell can be easily manipulated in FF3usMe. The spell Engulf has its special status to banish target from battle, but if allies are hit they will be transported to The Triangle Island Cave. You can Modify the spell not to do this or simply eliminate the spell engulf from its battle script