You can tell how many cheats a file has by its size. Last time I checked, this is the biggest cheat file I've seen so....here ya go. And for all you pokemon fans out there it works with all pokemon games.
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)