Pit in-games: Infface221-226 (six portraits, apart files, goes like pf/info/portrite folder).
Easiest for sfx is the following:
1. Go to resources on this site and download Supersawndz.
2. Download a clean file called smashbros_sound.brsar
3. Open the .brsar with Supersawndz
4. Locate Pit (should be one of the first ones on the list)
5: Highlight it (click on it) and click on that button with '...'
6: You have to choose a file. Change the format to sawnd
7: Locate the Waluigi sawnd file and click on it
8: Press insert
Done, make a folder called 'sound' on your SD card and put the smashbros_sound.brsar in there (you should have: Root of SD Card/private/wii/app/rsbe/pf/sound/smashbros_sound.brsar)
And for the portraits: Root of SD card/private/wii/app/rsbe/pf/info/portrite/Infface221-226)
Hope that was clear enough
let me know if you have any troubles.