Download a "100% save" or "DLC unlock" save file for Tekken Tag Tournament 2 from a reputable community site like GameFAQs or modding forums. :

He downloaded the file, extracted it with a deep breath, and transferred the contents onto his USB drive. He walked over to the sleek white console, plugged the drive into the port, and navigated to the system storage settings.

Before using external save files, note that much of the content in this game was released as free updates. Free DLC Characters

For Elias, this wasn’t just about skipping the grind. He was a historian of the digital pugilistic arts. He had played every entry in the Tekken series since the original arcade cabinet, but Tekken Tag Tournament 2 was the one that got away. His childhood Xbox 360 had succumbed to the dreaded "Red Ring of Death" back in 2013, taking with it a save file that had logged over 300 hours.