This is very good save file, I did all this without cheats and the game is beaten with very good pokemons!!! You can use it on pokemon diamond and pearl too!!!
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