Level 70, all skills (most of them mastered), all quests done, lots of items, Richiter and Sisters unlocked. Im using a G6 slot 2 so I dunno if it will work on other hardware. Plus this is for the US rom, dunno if it will work on the EU one.
I don't have a wii u anymore to test it myself, but if homebrews are not visible on the wii u menu I think you can press L + R + minus to open the plugin menu, there should be an option called "homebrews on wii u menu" or something similar
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)