You have the emulator and the ISO. Now, let's configure PPSSPP x64 for the best results.
This is the sensitive part. You are searching for "descargar juegos psp iso x64 best" – but you must do it ethically. Here is the hierarchy of sources: descargar juegos psp iso x64 best
For games no longer sold commercially, many archives exist. To find the best ISO files (verified, no viruses, trimmed for size), search for these terms instead of the generic keyword: You have the emulator and the ISO