Your save editor corrupts pokemon x/y savedata and it does not import the save data to the games, and the save editor also crashes after it exits. The save editor crashes on home menu emunand.
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