For Wii games, you can check the disc integrity straight from Dolphin. Right click your game in Dolphin, go to Properties and go to the Filesystem tab. Right click the Partition (not the Disc) and select "Check Partition Integrity".
You can also download free tools online that can generate MD5 hashes (just google around for some). Generate an MD5 hash for your game, then compare it to verified dumps from websites like Redump.org. If they don't match, that indicates that your dump is bad, but if they do, then you have a different problem.
You can also download free tools online that can generate MD5 hashes (just google around for some). Generate an MD5 hash for your game, then compare it to verified dumps from websites like Redump.org. If they don't match, that indicates that your dump is bad, but if they do, then you have a different problem.