Launch Tekken 3 on your PSVita and verify that all characters are unlocked. You should now have access to all characters in the game.
You're looking for a comprehensive guide on how to obtain a save file for Tekken 3 on the PlayStation Vita (PSVita) with all characters unlocked.
To unlock all characters in Tekken 3 on PSVita, you'll need to use a modified save file. This save file hack involves editing a specific file on your PSVita's memory card.