You need a Japanese ISO. Do not use a "pre-patched" ISO from random forums—they are often corrupted or have anti-piracy triggers.
The process of installing an English patch for Shining Hearts on the PSP involves several steps. First, players need to ensure they have a custom firmware (CFW) installed on their PSP, as the installation of patches requires more than the standard firmware capabilities. Next, they download the English patch files from a reputable source, usually a fan site or a gaming forum dedicated to PSP homebrew and patches. The patch files are then transferred to the PSP via a computer, and using a specific homebrew application, the patch is applied to the game. The process, while seemingly complex, is made straightforward by detailed guides available online. shining hearts psp english patch install