NEW GUIDE BY OMUK WITH NEW NETPLAY BUILD, CLICK HERE
THE GUIDE BELOW IS OUTDATED
Get a Brawl NTSC ISO
Download this zip file containing an sd.raw with Minus 4.0b on it, and the Brawl Minus SD Launcher.elf file
Copy the Brawl Minus SD Launcher.elf file into the folder you have set for Dolphin to find your games/isos
Restart/Open Dolphin
Put the sd.raw in this directory: C:/users/[yourusernamehere]/Documents/Dolphin Emulator/Wii.
Right click your Brawl ISO file and select "Set as default ISO"
Go into Dolphin's config menu and go to Wii
Check "Insert SD card"
If you host, host the Brawl Minus SD Launcher.elf