I really don't think you can yet.
But there was an event giving out an ARCEUS which has a special effect in HG/SS games.
You have to trade it from soul silver to heart gold this is the only way
No, the only way is to do cheats or an event, and there are no more events for Pokemon Heart Gold because there is a new Pokemon game they are doing special events on.
Sorry, the Wi-Fi event is over, but there is a Mew coming out in Heart Gold Soul Silver.
Lugia is not found in the wild in Pokemon Diamond. You must either trade from pal park, or trade with Heart Gold or Soul Silver.
There are basically no cheats in Pokémon Heart Gold without having a ROM or and ACTION REPLAY type thing. sorry :-(
Well I believe it was available for Mystery Gift in 2010 or 2011.
there is cheats you press oxoxoxoxtriangleoxoxsguarethenoxoxoxoxoxox
There is no possible way without hacking or cheating. I heard they are bringing Mew back in Pokemon Heart Gold and Soul Silver.
Sorry, you can't. The legendaries you can catch in Soul Silver with out events or cheats are: Raikou, Entei, Suicune, Lugia, Ho-oh, Zapdos, Articuno, Moltres, Mewtwo, and Groudon. Rayquaza if you can get a Kyogre that was caught on Heart Gold.
give victini a heart scale.it will try to learn fusion flare and fusion bolt
esy, go on you tube .com and if you type in "how do you get a mew witout cheats in heart gold?" ps. one of my fav. vids. is potty traning adn screeming eggs
The only way you can get Arceus in Heart Gold without cheating is to trade it from a game that already has Arceus.BTW, your question was in the wrong category, so I'll fix it.