The Action Replay code used to get all the key items in Pokemon HeartGold is 94000130 FFBB0000, 62111880 00000000, B2111880 00000000, D5000000 000101AD, C0000000 00000031, D6000000 000008E8, D4000000 00000001, D2000000 00000000. Because key items are unlocked during specific game events, using the code can harm some aspects of the game.
When players use the key items Action Replay code, they unlock items such as the Super Rod, Fashion Case and Bicycle. Players also unlock rare key items like Berry Pots, Squirt Bottle and Apricorn Case. Having these items early in the game can give players a slight advantage and save them the burden of hunting for them.