F.A.Q:
I want to make my own custom textures, how does this work?
The basic process involves using tools available such as SSBExtract to extract the texture files and edit them. They are then recompressed into Brawls special format using tools found in the Revolution SDK. I made a guide a while ago, but quite a few errors were found so I removed it. I will post it again after I make some changes.
Do I need a modded Wii to run this hack?
YES, you will need a modchip installed in your Wii (THIS IS REQUIRED, I can't say it enough).
In addition to the modchip, if you have updated your Wii to the latest firmware you will need the Homebrew Channel and a homebrew program called Gecko Region Free, which is found on the Homebrew Channel website (you do not need USB Gecko). If you haven't updated your Wii to the latest firmware, the modchip is all you need.
Does this hack work on Wifi?
The game should run fine on wifi and you will see any texture hacks that are on your disk. However, the people online will just see a regular character. i don't recommend playing on wifi, but being a 360 owner has made me paranoid.
Can I add new textures to the game, or just replace existing old ones?
With everything I've done so for, only existing colors can be replaced. However, I believe that it may be possible to use a USB Gecko to load completely new textures into the game. I don't have a USB Gecko, so it's just a theory.
Can character models be changed in any way?
Short answer, no. Long answer, I don't know but it is extremely unlikely. So far no one has figured out Brawl's model data. As I mentioned before I want to try to swap a character model with another existing in the game. The odds of it actually working though are slim to none.
Is it possible for this to do any damage to my Wii?
No. The worst that could happen is that the Wii freezes when trying to use the hacked chaaracter if it was done incorrectly. It will be fine on reset.