A native PSP version of Mortal Kombat: Shaolin Monks was never officially released; therefore, it cannot be played directly on the PPSSPP emulator. The original game was developed exclusively for PlayStation 2 and Xbox.
Mortal Kombat Unchained: If you specifically want an MK experience on the PPSSPP emulator, Mortal Kombat Unchained is the official PSP release. It features a massive roster and the "Konquest" mode, which offers a similar (though not identical) adventure feel. How to Set Up Mortal Kombat for Mobile/PC download mortal kombat shaolin monks ppsspp
Legal and Ethical Considerations
Make sure your device meets the minimum system requirements to run PPSSPP and Mortal Kombat: Shaolin Monks: A native PSP version of Mortal Kombat: Shaolin