I tried using smash bros already, though the region for my SSB is US while my wii is japanese? not sure if that matters, but my wii can no longer read it though? and I'll look into the other options!
Thanks!
I'm still curious, why is it you bought a Japanese Wii to play US games? Never mind that though, it's in the past now. If and when you manage to get it running again, please sell it off and buy a used American Wii. This way you can start from scratch and don't have to get confused with the regions. What I think there may have been some accidental conflict between the two regions and their updates. When you update your Wii using a game (when it won't let you play without updating), it doesn't retrieve the newest update from the NUS (Nintendo Update Server). The update is actually located on the game disk (and yes... I'm not a dumbass; I've looked inside a Wii game before). This is a way that Nintendo can keep everyone up to date even if you are not connected to the Internet. Seeing that you're using a Japanese Wii that plays any region of game to play a US regioned game which has a US system menu update on it, your Japanese Wii may have somehow allowed itself to install a US menu update. Seems puzzling that could occur. This could be a reason (among obvious others which currently don't apply right now with today's current firmware/Wii menu compatibility) you should not update your Wii and set it up so you won't ever have to for any new game with either the Priiloader (or something) or an alternate game loader.
On the more helpful side, ask DeadlyFoez for some help on what he is suggesting. I think he's trying to tell you how to get things running without using a game disk. I'll edit if I missed something...
You missed the fact that you don't need to sell and buy a new wii to install a usb loader and avoid conflicts like this. I would suggest you stop telling people to sell their property to avoid conflicts when perfectly viable methods are easily and readily available.
Now, OP, I am just throwing ideas around (as it's been a while since I've messed with Wii stuff), but since your Wii is chipped, does it still load in-region games at least (as in NTSC-J)? And then, how about physical backups of them? Would it be possible for you to download a DVD-5 rip of the NTSC-J brawl and burn it to a GOOD DVD-R media? (Many recommend Verbatim brand, I've used Memorex with 0 bad burns so far) If you can and can get it running, Wiibrew has a link to an unofficial NTSC-J version of Smash Stack
here.
Not to say it will solve your problems, but no progress is gonna be made if no ideas are tossed around. For now, this is the best I have, anyone feel free to correct me should I be wrong in what I had suggested.