The most reliable community-vetted save files are hosted on . Depending on your game's region, you can find the appropriate files here:
Since raw binary data (which makes up a PSP save file) cannot be reliably copied and pasted as text without becoming corrupted, it is safer to download the pre-packed save folder. savedata de naruto ultimate ninja heroes 2 psp
Download your desired save file (usually a folder named ULUS10341 for the US version or ULES01106 for the EU version). Copy the folder into the SAVEDATA directory. Disconnect and boot up your game! For PPSSPP (PC/Android): The most reliable community-vetted save files are hosted on