Open the UPR-ZX application folder and launch the .jar file. Click the button in the top right corner.
Ensure your device meets the requirements for running the emulator smoothly.
A Pokémon randomizer is a tool or a pre-patched ROM hack that changes the fundamental data of the game. Instead of encountering a Rattata on Route 29, you might run into a wild Rayquaza. Instead of a Fisherman with six Magikarp, you might battle a trainer with a team of legendary beasts.
The modding community is still very active. Here are some modern resources: