If you own a PS3 and a PSP, this is the method.
Because there is no official port, the "PSP version" users often refer to consists of fan-made mods . These are typically based on Mortal Kombat: Unchained , the official PSP port of Mortal Kombat: Deception Mortal Kombat Wiki MK vs. DC Mod for PPSSPP mortal kombat vs dc universe psp top