100% complete save! White unlocked for Story and Battle Modes. Black unlocked for Battle Mode. Game cleared without getting hit once for a "Perfect Code" display on the title screen!
Data 1: White selected, all stages cleared, all crowns and all five carrots obtained. Secret Stage 7 (re-match any of the game's bosses) unlocked!
Note: Loading Data 1 will bring you to the final boss. Beat it to view the game's ending or pause and select "Exit Stage" to access the stage select menu.
Note that this save file is indeed for the Japanese version of the game, which features more content than the US release. Best played with Zoinkity's English translation patch found here: https://www.romhacking.net/translations/2767/