Make sure you have a good dump of the game. Dolphin can give you the MD5 hash of your game (right-click the game in Dolphin's game list -> Properties -> Info tab -> Compute). Compare this with other verified hashes from sites like rawdump.org. If your hash is incorrect, you have a bad dump. You need to try dumping or "ripping" your disc again until you get one that works.
If it turns out you have a good dump but still get freezes, post screenshots of your settings so we can see what's going on. First check your hashes though.
If it turns out you have a good dump but still get freezes, post screenshots of your settings so we can see what's going on. First check your hashes though.