Pokemon HeartGold Action Replay Codes

HeartGold runs on Action Replay codes rather than the GameShark format used by the GBA games — a different code system built for the DS, but the same idea: a short hex string patches game memory live while Delta runs the ROM, no permanent file edits involved. These codes are matched to the standard USA HeartGold cartridge dump.

The set below covers the requests that come up constantly for HeartGold: infinite Master Balls for locking down Ho-Oh, Lugia, or any of the roaming legendaries without a missed throw, walk-through-walls for exploring or clipping past obstacles, and a shiny-encounter code for anyone chasing a specific shiny in the Safari Zone or elsewhere. A few extras round out the leveling and item side.

Action Replay codes on DS titles can occasionally desync with certain in-game events if left on too long — toggle Walk Through Walls off before entering a scripted cutscene or gym battle to avoid a stuck screen.