C:\Users\[YourUsername]\AppData\Local\PCSX2\cheats\ or the cheats folder inside your portable installation directory.
Pnach Code Manager
Codes meant for the standard North American (NTSC-U) or European (PAL) versions will not work with this CRC. How to Set Up Your PNACH File
If your cheats aren't working, don't worry. Here are the most common fixes:
// Final Fantasy X International (NTSC-J) * // File generated by [Link] * [Page 1\(M) Must Be On Code] author=Rebecca, Tomo, Shin, Final Fantasy X International PNACH Codes | PDF - Scribd
Instead of typing hundreds of lines manually, the community maintains a containing over 300 codes for 658597E2 .