For those playing on original hardware, you can find 100% completed save files on GameFAQs or repositories like MarioCube .

Using a pre-completed save file allows you to bypass these requirements and dive straight into competitive play. How to Install Save Data on a Wii

Locate the game's ID, which is SNXJ for the Japanese version.

You can automatically unlock all characters by playing every game mode at least once and accumulating 12 hours of total playtime.

Some Wii saves are flagged as "no copy." You may need to use Gecko OS or Priiloader to remove these flags before the system allows you to overwrite the data. Using Save Data in Dolphin Emulator

Many top-tier fighters are locked behind specific character paths. For instance, completing Sakura’s GNT mode unlocks Chiyo, and finishing Jiraiya’s path unlocks Sage Mode Naruto.