To get a working randomized version of Pokémon Black 2 or White 2, the standard and safest method is to use the Universal Pokémon Randomizer on your own clean ROM file.
Black Screen on Startup: This usually happens if you try to randomize a ROM that already has a "fan translation" or "EXP patch" applied. Always use a vanilla ROM. pokemon black 2 and white 2 randomizer rom download work
Once you have your generated .nds file, simply move it to your phone’s storage or your R4 card’s SD card. Because the file is already patched by the randomizer tool, it should run exactly like a standard retail game. To get a working randomized version of Pokémon
Customize: Navigate the tabs to change Wild Pokémon, Trainer rosters, Starter Pokémon, and even TM/HM compatibility. and even TM/HM compatibility.