Despite the game not being officially released for PSP, some developers and gamers have managed to create and share ISO files of the game for PSP. These files can be downloaded and installed on a PSP device using a custom firmware or a PSP ISO loader.
If you'd like, I can help you identify the correct Mortal Kombat titles actually released for PSP, or point you to legal sources to buy MK9 for PC/Vita instead. Just let me know. mortal+kombat+9+psp+iso+download+exclusive
