No. This is the most important point. Mortal Kombat 9 (also known as Mortal Kombat 2011) was never officially released for the PlayStation Portable (PSP).
The confusion likely comes from two sources:
No. Mortal Kombat 9 (also called Mortal Kombat 2011) was never released for the PlayStation Portable (PSP). The last Mortal Kombat game officially released for the PSP was Mortal Kombat: Unchained (a port of Mortal Kombat: Deception with extra characters) back in 2006.
So why are there so many websites claiming to offer a "MK9 PPSSPP ISO"? Here are the most common truths behind those links:
Mortal Kombat 9 (2011) was released for PlayStation 3, Xbox 360, and PC. It was never released for the PlayStation Portable (PSP). Therefore, a legitimate "Mortal Kombat 9 ISO for PPSSPP" does not exist.
If you see files online claiming to be "MK9 for PPSSPP," they are usually one of two things: