While most codes are for the original PlayStation version, modern emulators like RetroArch can use these directly via their built-in cheat menus. Suikoden 1 & 2 Cheat Codes Guide | PDF - Scribd
Here is a comprehensive guide to using GameShark codes to fill your inventory in the original Suikoden. How GameShark Codes Work in Suikoden suikoden 1 gameshark codes have all items