While a direct PSP ISO for Shaolin Monks does not exist, here is how you can play it on modern devices:
This is the only full Mortal Kombat title officially released for the PSP. It is a port of Mortal Kombat: Deception mortal kombat shaolin monks iso file for ppsspp top
Once you've downloaded the ISO file, follow these steps to play Mortal Kombat: Shaolin Monks on PPSSPP: While a direct PSP ISO for Shaolin Monks