This is a running list of all compatible Brawl ISOs that can be used on the ladder.
How do you find out?
Go into dolphin, Right Click the Brawl ISO > Properties > Info and Press Compute to generate the MD5 Checksum.
If this method fails, Download This Program (WinMD5 Free) and Drag and Drop the ISO in it to generate an MD5:
If you have anything to add (with proof) please leave me a message and I will be sure to test it.