im keen to know this too...
Im using a pal wii and have loaded an ntsc version of the game through usb loader gx.
Whilst running regular brawl the loader seemed to work well, i changed some settings trying to fix the first issue i had (i will explain) and i think it caused it to freeze, but not sure at this point.
One problem i have definitely had is problems loading project m in the usb loader.
I both switch ocarina on and change the hook to what is instructed. It loads to brawl (so there is no project m banner that appears and the characters in the intro are not hazed purple). When i get to the character select i move my cursor around a little and the console will freeze and emmit a buzzing/humming noise.
This was the first issue i had.
Next, i changed the video settings to 'force pal50'.
This slowed everything down a LOT and ruined the pixel quality, however it meant i could try out some of the new characters that were on character select.
As it turns out, project m wasnt even active at this point as the only 'new' chars was the division of the pokemon trainer into 3 seperate areas. Same for Shiek and zero suit samus.
The melee styled gravity and play style did not work.
i've followed the 'project M on a pal wii' guide from this forum to no avail, ive completed step 10 and 11 and have the sd card in my wii to load the usb loader gx and then smash bros brawl with ocarina.
Is it possible i need to load gecko through the usb loader gx, onto the ntsc version of brawl using the custom map/arena generator?
I would very much like to have P.M working on my wii and i've looked everywhere i can for solutions to these problems which is how i got this far.
Can someone please show me the way?