Modern smartphones are more powerful than the PSP. Using AetherSX2 (a PS2 emulator for Android), you can run the entire Fatal Frame trilogy at full speed. Pair a Razer Kishi controller, and you have a better portable solution than any PSP ISO.
: A unique reimagining of the first Silent Hill game with an emphasis on psychological profiling. Corpse Party Fatal Frame Psp Iso
The PS Vita can natively run PS1 and PSP games via Adrenaline emulator. More importantly, the Vita has a homebrew PS2 emulator (though still in early stages). With moonlight streaming, you can also stream Fatal Frame from a PC to a Vita. Modern smartphones are more powerful than the PSP