Things You'll Need
Instructions
Action Replay
Place the "Pokemon HeartGold" game cartridge into the Action Replay device and insert the device into your Nintendo DS.
Turn the DS on and enter the following cheat at the cheat screen:
52247dac 582000c0
12247daa 00004801
02247dac e0021c39
02247db0 00000182
d2000000 00000000
Start the game normally and make your way to any patch of grass. Walk into the grass. After a few steps, you will be attacked by a Deoxys.
Weaken the Deoxys and use any Pokeball to catch it.
Trading
Find someone who has a Deoxys on her copy of "Pokemon Diamond," "Pokemon Pearl," "Pokemon Platinum, "Pokemon SoulSilver" or "Pokemon HeartGold."
Make your way to any Pokemon Center; have the other person do the same. Go to the second floor of the Pokemon Center.
Speak to the trade attendant at the far right of the second story. Select "Trade" to initiate the trade. Have the other person do the same.
Select the Pokemon you wish to trade and press "Confirm." Have your partner select Deoxys and press "Confirm." The trade will then commence. After the trade is ended, Deoxys will be in your party.
Pal Park
Insert a "Pokemon Sapphire," "Pokemon Ruby," "Pokemon Emerald," "Pokemon FireRed" or "Pokemon HeartGold" game cartridge containing Deoxys into the cartridge slot of your Nintendo DS.
Travel to Pal Park on Route 221. Talk to the attendant to begin the Pal Park process.
Select six Pokemon you wish to transfer from the Game Boy Advance game to the Nintendo DS game. Make sure Deoxys is one of them.
Complete the Pal Park mini-game by capturing all six Pokemon. Once you have completed the mini-game, Deoxys will be in one of the boxes in your PC.