Catch a Mewtwo on Route 201 or face a Dialga in the Great Marsh.
Apply modifications directly to the clean base file using a desktop randomizer application. Pokemon Diamond Randomizer Rom Download
You need a standard, unmodified .nds file of Pokemon Diamond. Catch a Mewtwo on Route 201 or face
Combine a randomizer with Nuzlocke rules. the legal risk exists
: The most reliable and long-standing Nintendo DS emulator for desktop computers.
Nintendo is notoriously protective of its intellectual property and has aggressively pursued legal action against ROM distribution websites. While individual ROM downloaders are rarely targeted, the legal risk exists, and users should be aware of the potential consequences.
: In the UPR-ZX settings, check "Similar Strength" for wild encounters so you do not run into Level 3 Arceus or Legendary Pokemon immediately.