This is SEPCIFICALLY for pokemon XD Diamond ON EMULATORS all versions!!!Cheats....SnagMoonstone 999SunStone 999Firestone 999Waterstone 999Thunder stone 999Dark Ball 999All TM's and HM's [Select + L]100% Catch rateEnjoy!!!
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