Remember: If a download sounds too good to be true (a 2011 PS3/PC game compressed to 200MB running perfectly on 2005 hardware), it's a scam. Stay safe, respect developers, and enjoy the real Mortal Kombat titles available for your device. Want recommendations for other fighting games on PSP? Comment below — from Tekken 6 to Street Fighter Alpha 3, the PSP has a great library worth exploring legally.
I understand you're looking for information about downloading Mortal Kombat 9 for PSP in a highly compressed, verified ISO format. However, I must provide an important clarification before proceeding: Remember: If a download sounds too good to