It is important to understand that Mortal Kombat 9 was never officially released for the PlayStation Portable (PSP). The game that exists on the PSP/PPSSPP platform is typically a or a heavily modified version of Mortal Kombat: Unchained or other MK titles, featuring: Characters and skins from MK9/MK2011. Updated textures and UI. Improved Fatalities and combat moves.
Once you have a legitimate PSP game file (like Unchained ), here is a general guide to setting it up on the PPSSPP emulator. These steps are based on standard emulator usage guides and general user reports. Mortal Kombat 9 Ppsspp Iso File Download Highly Compressed