There is no official version of Call of Duty: Black Ops released for the PlayStation Portable (PSP) or for use on the PPSSPP emulator. Call of Duty: Black Ops was originally released for platforms like PlayStation 3, Xbox 360, and PC. Official Call of Duty Game for PSP
If you specifically want Zombies on PPSSPP, you have one option:
Call of Duty: Zombies (Homebrew) – A fan-made demake of Kino der Toten. Search for CoDZ_PSP_Full.iso on archive.org. It is glitchy but playable. call of duty black ops ppsspp game download link
The main draw is portability. Being able to play a high-intensity shooter on your phone during a commute—with the ability to save your state at any second—makes the PPSSPP experience superior to the original hardware for many fans. There is no official version of Call of
Gameplay: It features 14 missions and allows you to play as American, Canadian, and British soldiers. Search for CoDZ_PSP_Full