You’re staring at a Level 100 Red on top of Mt. Silver and your Typhlosion is barely hanging on at Level 65. We’ve all been there. Johto is notorious for its brutal level curve, and sometimes you just don't have forty hours to grind against wild Miltank. That’s where heart gold action replay codes come in. But honestly? Most of the lists you find on old forums from 2010 are either broken or formatted so poorly they’ll crash your save file faster than a corrupted MisingNo.
I’ve spent way too much time testing these on actual hardware and emulators like Delta. You need to be careful. One wrong line and your bag becomes an endless void of "???" items.
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The Codes Everyone Actually Wants
If you’re digging for codes, you probably want the "big three": money, Rare Candies, and those elusive Master Balls. Forget the complex "encounter modifiers" for a second. Let's look at the basics that won't brick your cartridge.
Max Money (Press Select)
Tired of being broke after buying ten Hyper Potions? This basically sets your wallet to the cap of 999,999.94000130 FFFB000062111880 00000000B2111880 0000000000000088 000F423FD2000000 00000000
99 Rare Candies (Hold L+R)
This is the one. You need to hold L and R while opening your bag. It targets the first slot of your Medicine pocket. Pro tip: move a useless item like an Antidote to the first slot before activating this, or you might overwrite something important.94000130 FCFF0000B2111880 00000000E0000B74 000000A003E70032 00000000D2000000 00000000
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Infinite Master Balls (Hold L+R)
This puts 493 Master Balls in your bag. Why 493? That was the total Pokédex count back in the Gen 4 days.94000130 FCFF000062111880 00000000B2111880 0000000000000D14 01ED0001D2000000 00000000
Why Your Codes Keep Crashing the Game
It’s annoying. You enter the code, press Select, and the screen goes white. Or worse, the music keeps playing but your character is frozen.
Most people make the mistake of enabling ten codes at once. Don’t do that. The DS has very limited RAM. When you're forcing the game to constantly rewrite the item pocket, the encounter tables, and the "walk through walls" logic all at the same time, it panics.
Stick to one category at a time. If you’re generating items, do that, save, and then restart without the code before trying to use a "Shiny Encounter" modifier. Also, check your Game ID. The North American version (IPKE-4DFFBF91) uses different memory offsets than the European or Japanese versions. If you’re using a European ROM with US codes, you're going to have a bad time.
The "Holy Grail" Modifiers
There are some codes that go beyond just giving you items. These change how the game actually plays.
Walk Through Walls (Hold L)
This is legendary. It lets you skip the annoying Sudowoodo or get to Kanto early. Just be careful—if you walk off the edge of the map, you can get stuck in "The Void," which can sometimes corrupt your save data if you're not careful where you save.9205daa2 000002001205daa2 00001c20d2000000 0000000094000130 fdff00009205daa2 00001c201205daa2 00000200d2000000 00000000
100% Catch Rate
Basically, any ball you throw will act like a Master Ball. It’s perfect if you want to catch Lugia in a Luxury Ball for the aesthetic without resetting fifty times.9224670a 000021011224670a 00002100d2000000 0000000092247612 0000280112247612 00004280D2000000 00000000
The Shiny Pokemon Hack
Everyone wants a red Gyarados—well, a second one, anyway. The Shiny code for Heart Gold is actually a massive string of hex. It works by checking the PID of the encounter and forcing it to match your Secret ID (SID).
The catch? Pokemon caught this way are technically "illegal" for official competitive play (if you still do that on fan servers), and sometimes their Natures get messed up. Use it for the cool factor, but don't expect them to be battle-ready out of the box.
Getting It Done Safely
If you're on a real DS, you need the physical Action Replay cartridge. If you're on a 3DS, you likely need a custom firmware setup with "Checkpoint" or "PKSM" because physical ARs have trouble with the 3DS's hardware encryption.
- Backup your save. I cannot stress this enough. Use a save manager if you can.
- Input manually. One typo in a 16-digit string makes the code useless or dangerous.
- The "Master Code" myth. Most modern emulators and AR versions don't actually need a Master Code (Enable Code) anymore, but if your specific device asks for it, make sure it matches the Game ID.
Next Steps for Your Johto Journey
If you've successfully injected your Rare Candies, your next move should be checking your Pokemon's IVs and EVs. There are specific Action Replay codes that let you see these hidden numbers in the summary screen. Knowing that your Typhlosion has a 0 IV in Special Attack might explain why it's struggling, even at Level 100.
Once your team is boosted, head back to the Pokemon League. With the level gap closed, you can finally experience the Kanto post-game without the tedious weeks of grinding. Just remember to disable the "Walk Through Walls" code before you enter any buildings, or you might end up spawning inside a black void.
Check your Game ID by looking at the small print on the back of your cartridge or checking the header info in your emulator settings to ensure code compatibility. Save often, and always in a "safe" location like a Pokemon Center.