There's site called www.gamerevolution.com
and they claim that you can get Super Saiyan level 4 Goku in DragonBall Z Budokai like this:
"Unlock SS4 Goku:
Beat World Tournament mode with all characters on Advanced level. SS4 Goku will be behind normal Goku - press Select + X and SS4 Goku's picture will appear. "
can anyone confirm this?
I personally think that it's a load of BS but wouldn't it be cool if it were real!? If anyone wants to take on the challenge and then report what happened: PLEASE DO SO! (^_^)