"Highly compressed" files (often advertised as ~500MB instead of the original ~1GB+) are common in the emulation community but come with trade-offs: Performance Risks
Search for "Mortal Kombat Shaolin Monks PPSSPP Highly Compressed 300MB" or "MK Shaolin Monks PS2 to PSP conversion". Some popular archive sites (like Internet Archive) or emulation forums (like r/Roms megathread) host these files. Look for the following file names: