This patch unlocks both hidden characters (Super Saiyan Goku and Broly).
It is in ips format and can be applied to both revisions of the Japanese version of the game. The French version has all characters available from the start.
Thanks to
http://www.romhacking.net/forum/index.php?topic=27795 for the request and cheat codes.
NTSC-J (Rev 0) CRC32: A5E37609
NTSC-J Rev 1 CRC32: 081FDE86