The real way to get all sayins and ss4 Goku(on Japanese)is,at start screen press left,right,down,up,left,right,down,up quicly and you will hear a beep.
Then press triangle 9 times and x 9 times you will hear another beep.Also,to fight ss4goku you must beat hard mode without any continues.
Beat him and on the credits it will have the secret charecters.
If you need more help, we've got more Dragon Ball GT: Final Bout cheats and also check out all of the answers for this game
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