Yes, i have the right path and code for my region. Name the texture exactly, FitNessXX.pcs (example). What i might find to be the problem is that the gecko os homebrew program isn't doing its job inputing the cheats.
edit: never mind, i got it to work... i guess i just had to wait longer on the character selection screen.
About that, if you head to the stage select screen too quickly, then the fighter's PAC file is loaded instead of his/her PCS file.
If you have both the PCS and PAC files, then your texture should load up, regardless of how quickly you access the stage select screen.