If you want to do it yourself without a save:
If you want to skip the grind and unlock all characters, you can download save files from sites like Installation Steps by Device: PSP Console Connect your PSP to a PC via USB. Navigate to the folder, then the Copy the downloaded folder (e.g., for EU) into this directory. PPSSPP (PC) Extract your downloaded save file. Move the folder to Documents\PSP\SAVEDATA PPSSPP (Android) Use a file manager like to extract the ZIP file. Move the extracted folder to PSP/SAVEDATA Save Data Dragon Ball Z Shin Budokai 2
If you are playing on an emulator, the process is straightforward. If you want to do it yourself without