The torrent and archive landscape changes monthly. However, the for verified, working compressed ISOs is the Internet Archive (archive.org) . Search for "Super Smash Bros Brawl (USA) (En,Fr,Es) (Rev 2) RVZ" – the RVZ format is Dolphin's native compressed format and is superior to ZIP.
These remove "junk data" used to fill the physical Wii disc but keep all game content intact.
By choosing the right format, you can keep the entire roster of Nintendo legends on your drive without sacrificing your storage space.