The most reliable tool is . Ideally, you want BootMii installed as boot2 (the earliest boot stage), but installing as an IOS works for dumping too.

One major reason to use a real NAND dump is (the custom replacement for Nintendo Wi-Fi Connection).

: In Dolphin, go to Tools > Manage NAND > Import BootMii NAND Backup and select your dumped files. Key NAND Locations Windows : Documents/Dolphin Emulator/Wii .

If you search the web, you will find websites offering a one-click .bin file. Ignore them. They are illegal, dangerous, and often broken.