Players using emulators or homebrew on the Nintendo 3DS sometimes use QR codes to install "CIA" files or patches for HeartGold . These codes act as direct download links for the console's Internet Browser to fetch game data or cheats.
The DS generation (2004–2011) did not have onboard cameras capable of reading QR codes. The DSi and 3DS had cameras, but the Heart Gold game cartridge was never programmed to interpret QR data. Pokemon Heart Gold Qr Code
If your goal is to get "official" event Pokémon (Mystery Gifts) without hacking or using QR codes, you can use the . This method connects your game to fan-run servers that still host original distribution data. Players using emulators or homebrew on the Nintendo