The 2021 versions of the Inazuma Eleven PSP ISO are typically fan-made "Best" or "Complete" editions. These are often based on Inazuma Eleven 1·2·3!! Endou Mamoru Densetsu , optimized for the PSP via the PPSSPP emulator. English Translation

If you want the original RPG gameplay, you can play the Nintendo DS titles using an emulator, as many have complete fan translations. Inazuma Eleven 1

Looking back, 2021 was the perfect storm for Inazuma Eleven on PSP:

While there is no official game released for the PlayStation Portable (PSP), the "2021 PSP ISO" usually refers to fan-made mods or unofficial ports created by the community. The Inazuma Eleven "PSP" Context