The files you are likely looking for usually consist of two parts:
If you specifically wanted (the 1v1 fighting game with the Sasuke vs Killer Bee boss fight), you cannot play it on PPSSPP . You would need a PS3 emulator (like RPCS3 on PC) or an actual PS3/Xbox 360. naruto shippuden ultimate ninja storm 2 ppsspp zip file
Because Storm 2 is a graphically intense conversion, you need to tweak your settings for smooth gameplay (30 FPS target). The files you are likely looking for usually