1.Get brawlbox
http://www.smashboards.com/showthread.php?t=2388612.Download the origonal character pac. you want to edit.
3.open in brawl box
4.Export the texure you want to edit (It will come out as a png. image file)
5.Edit the image how you want.
6.Replace the texture in the pac. file with your edited one
7.Save
8.Done!