Services like or Xbox Cloud Gaming (if you own the game on Xbox) allow you to stream Pirate Warriors 4 to your Android or iOS phone. No PSP ISO needed – just a good internet connection and a controller clip.

Here is the installation guide for the legitimate PSP games:

The PlayStation Portable was discontinued in 2014. One Piece: Pirate Warriors 4 was released in 2020 (Japan) and 2021 (Worldwide). The PSP simply does not have the hardware power to run a 3D musou game with hundreds of enemies on screen.