Use tools like DAT-o-MATIC to check the hash (CRC32/SHA1) of the ROM file to verify if it is a clean, authentic dump.
If you are looking into this specific version for archival or gameplay purposes, you may encounter the "Blue/Black Screen" bug, which was the game's original defense against unauthorized copying. 4780 pokemon heartgold u %29%28 xenophobia
: The URL-encoded format for closing and opening parentheses )( . Use tools like DAT-o-MATIC to check the hash
Here is a helpful feature/guide on how to fix the freezing and saving issues for that specific ROM version. 4780 pokemon heartgold u %29%28 xenophobia