Disclaimer: The following information should only be used for legally downloading content that has already been purchased.
Acquire a license for the DLC you want, and one file from each DLC generation you want (there is a wad that does this).
Install uLoader and enable NAND emulation.
Get...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced