To play a randomized version of Pokémon HeartGold , you generally do not download a pre-randomized ROM. Instead, the standard and safest method involves downloading the Universal Pokémon Randomizer tool and applying it to a clean Pokémon HeartGold ROM you already own. Essential Tools
Randomizers can be frustrating if done incorrectly. Nobody wants to face a Level 13 Lance with a team of Dragonites on the third route. Here are the "Goldilocks" settings for Heart Gold: Pokemon Heart Gold Randomizer Rom Download
To play it, you need a DS emulator:
Disclaimer: Downloading ROMs of copyrighted games you do not own is generally a violation of copyright law. This feature is for educational purposes regarding the ROM hacking community and game modification. To play a randomized version of Pokémon HeartGold
Alternatives:
Nuzlocke Challenges: Many fans combine the randomizer with Nuzlocke rules (only catch the first Pokémon on each route, and if a Pokémon faints, it's "dead") for the ultimate test of strategy. Nobody wants to face a Level 13 Lance