Do not search for a native ISO. You won't find one. Instead, you need to learn about emulation .
⚠️ Note: This guide is for educational purposes. You should own legitimate copies of any games you emulate. Super Mario Iso Psp
For the best experience, try on DaedalusX64 or Super Mario World on snes9xTYL. Both run surprisingly well on PSP! Do not search for a native ISO