You will see shady websites offering a “Ben 10 Omniverse PSP APK.” They are malware. PSP games are not native Android apps.
If you specifically want to use the emulator, there are several actual PSP titles from previous series that run perfectly on Android: Game Title Original Platform Series Era Ben 10: Protector of Earth Classic Ben 10 Ben 10: Alien Force Alien Force Ben 10: Vilgax Attacks Alien Force Ben 10: Ultimate Alien: Cosmic Destruction Ultimate Alien How to Install and Play (Emulator Guide) ben 10 omniverse psp game download for android high quality