Region Changer and Homebrew Channel i guess , if you change the Versions. Only the Japanese Disk: I think you can it play as PAL and NTSC Disks but that idk really. Hopefull other People will answer this question better. :)

If you want to play a NTSC-J disc on your PAL or NTSC-U gamecube/wii you will have to either (soft)mod the wii or purchase a Freeloader which removes the region lock.

The characters (kanji) will be all kinds of messed up though because your wii/gc doesn't support those characters.

Yeah, for example, in Resident Evil 2 on Gamecube, when you select "Leon Story" or "Claire Story" it usually brings up a message saying "Loading Leon's story" but on the japanese version, it just brings up a load of garbage characters because my PAL Gamecube does not support the japanese kanji.