You can enable PPSSPP’s built-in cheat engine to unlock:

AetherSX2 or DamonPS2 are popular choices for Android.

Download a .ini cheat file for Mortal Kombat: Unchained and place it in PPSSPP/assets/cheats/ .

If the Shaolin Monks conversion is too buggy or you simply can’t find a reliable ZIP file, here are alternatives:

One day, a brave warrior named "Android_user" embarked on a perilous journey to revive this classic game. Armed with a trusty PSP emulator and a burning desire to experience the iconic battles of Scorpion, Sub-Zero, and Raiden, Android_user set out to find a way to download the elusive Mortal Kombat: Shaolin Monks on their Android device.