It sounds like you might be looking for a specific fan-made version of the game, as the official Dragon Ball Z: Shin Budokai series only released two main titles for the PSP: Shin Budokai and Shin Budokai – Another Road.
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However, the modding community has kept this game alive for nearly two decades. When you download a file labeled "Shin Budokai 9," you are downloading a fan-made modification that transforms the old game into a modern roster brawler. Here is a breakdown of the experience. It sounds like you might be looking for
Everything labeled "Shin Budokai 3" through "Shin Budokai 9" is a community-created mod. These versions typically utilize the core fighting mechanics of the 2006/2007 titles but replace textures and character models to include fan-favorites such as: Goku Ultra Instinct Gohan Beast Vegeta Ultra Ego Broly (DBS Version) Playing on PPSSPP Here is a breakdown of the experience
Important Note: There is no official "Shin Budokai 9" game. The latest official entries are Shin Budokai (2006) and Shin Budokai: Another Road (2007). The "9" you see in search trends usually refers to a modded (hacked) version of Shin Budokai 2 (Another Road) that includes extra characters, transformations, and stages. This is a fan-made ROM hack.