Another option is to visit GameFAQs, a well-known database for video games. You can search for the game and check if there's a PSP ISO download available.
Download the PPSSPP Emulator from the Google Play Store or their official website. Another option is to visit GameFAQs, a well-known
Leo had played it at his cousin’s house on the PlayStation 2, but he wanted it for himself—portable, ready to go on his rusty, second-hand PlayStation Portable (PSP). There was only one problem: the memory stick in his PSP was a paltry 1 gigabyte. A full ISO of the game clocked in at nearly 1.5 GBs. It was a digital impossibility. Leo had played it at his cousin’s house
Websites like offer ROM downloads specifically for PSP emulators. Their Ben 10: Protector of Earth page explicitly states that the ROM is provided “for backup and educational purposes only” and even includes emulator recommendations. Other archive-style websites such as RomsMode and Gamulator may also host the file. It was a digital impossibility
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Ben 10 Protector of Earth PSP ISO Highly Compressed Download Guide