Just check the GamesFaqs SSBM area with teh Bonuses FAQ. Then sit around with your Gamecube and go down the list. . . it takes forever.Unfortunately, there is no easy way. But they're all really easy to get minus like 3.
GAMEFAQS049: Diskun [Disk System] [Japan Only] "This little guy is the adorable mascot for a Nintendo Entertainment System peripheral device released in 1985. Using the disk system, you could rewrite games for 500 yen, an epochal and economical feature. Funnily enough, the instruction booklet was sold separately for 100 yen. The disk system's first game was The Legend of Zelda."