on the go, modern emulation on Android or handheld PCs (like the Steam Deck) is the standard way to do it: AetherSX2 / NetherSX2 (Android): You can run the PlayStation 2 ISO . Most modern mid-range phones can handle this.

If you are looking for a "highly compressed ISO" for this specific title on PSP, you will likely encounter fake files, malware, or "fan-made" mods of other games (like Syphon Filter

Unfortunately, many sites promising "highly compressed 50MB" versions of 2GB games are often providing corrupted files or malware. Why Do People Want "Highly Compressed" ISOs?