You can only get with action replay or an event. its hard I'm not a expert but your pose to get a ticket from wireless ports so
try doing that connect to a wireless person in the Pokemon center You can´t catch it in hg or ss, but you can trade it from a gameboy game if you have deoxys on it, to do this you need a ds lite or ds but not a dsi or dsixl as they don´t have a gameboy slot at the bottm. You cannot catch Deoxys in HGSS. Either hack or trade. deoxys is a new Pokemon you can not catch him.
Hacking and migrating a (hacked) event one from emerald
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If you have action replay you can get any Pokemon you want. This feature works only in Pokemon Heartgold , Soulsilver and Platinum.
It is impossible to catch a Deoxys in the wild in HeartGold & SoulSilver. You need to get one at a Nintendo Event or transfer one from a GBA game. Theres a Deoxys mission in the 3rd Ranger game. Capture it and it will be comfortable in any 4th gen game.
Unfortunatly, not -.-
Before I go on, I'd like to say that without a Cheating Device, you cannot get these Pokemon from HeartGold.Deoxys - Migrate from the GameBoy Pokemon Cartridges to Pokemon Pearl or Diamond by using the Pal Park. Afterwards, trade Deoxys to HeartGold or SoulSilver. (By the way, Deoxys can be found at Birth Island in the GameBoy Pokemon Cartridges.)Mew - It seems that Emerald is the only GameBoy Pokemon Cartridge that has Mew. Migrate Mew to Pokemon Pearl or Diamond, like Deoxys, and trade it to HeartGold or SoulSilver. (Mew can be found at Faraway Island in Emerald.)Celebi - Migrate from the GameBoy Pokemon Cartridges to Pokemon Pearl or Diamond by the Pal Park. Do the same with the others and trade Celebi to HeartGold or SoulSilver. (Nintendo Event is needed for this lovely Legendary.)
I don't think there is a code. But i know a few methods to get the Pokemon. 1.you can trade it from Pokemon Platinum,Pokemon Diamond,or Pokemon Pearl. 2.In Pokemon,Platinum,Diamond and Pearl there is a Pal Park,(You need national dex),which you can get your old Pokemon from LeafGreen,FireRed,Ruby,or other Role-Playing Pokemon games. 3.there is a code,a Pokemon modifier,were you can get Pokemon 1-493. I hope i helped if you look on Google for "heartgold deoxys ar codes" it should be the 5th link