Since HeartGold is a Nintendo DS game, you need a solid emulator.
If you are making your own (or searching for a pre-made version), avoid softlocks. Here is the "Goldilocks" preset: pokemon heartgold randomizer rom download android updated
The Ultimate Guide to Pokémon HeartGold Randomizer for Android (2026 Update) Since HeartGold is a Nintendo DS game, you
(Recommended): This is the gold standard for Gen 4 games. It supports randomizing starters, wild encounters, trainer teams, and move sets. such as DraStic or MelonDS .
: The app will generate a new randomized ROM. Open this file using a reputable DS emulator for Android, such as DraStic or MelonDS .