Quote : "No cheats used, all chars, boxes, home tutors, and all gallery items unlocked, all gatchpons are sold out, completed on easy for you to try the harder modes"-From Gamefaqs
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)