You can send it from Pokemon Diamond Pearl or Platinum after obtaining it form an event, or use a cheat code.
in Union cave
You dont get arceus sorry
Soulsilver=SS heartgold=HG KK=O.K
The Arceus that was given away for the Sinjoh Ruins event in HG/SS was given away in Japan from 7/18/09-9/30/09 and in North America from 9/7/09-9/15/10. The Arceus event in now over.
Mt. Silver, Safari Zone, or route west of Cianwood
yes you can
You cannot get it in-game; you have to trade it from D/P/Pt, or get it from an Arceus event for HG/SS.
There is no in-game way of getting Arceus in HG/SS.
That is impossible! You can get it from action replay on some older games like Platinum, Pearl and Diamond! Pokeaster.
Any time you have arceus in your HG/SS party and go to the ruins then the event will happen!
You cannot catch Palkia in HG/SS. To obtain Palkia u will need to get TRU Arceus to do the Arceus Event in the ruin of alph.
in Union cave
you can only do it in two ways. 1. the hg/ss event arceus 2.use action replay
You CAN'T find an Emolga on Pokémon Heartgold. It was introduced in Pokémon Black and White, which was released a whole year after HG/SS. Answer: You can't find Emolga on HG/SS.
Sadly, you can't get Arceus in HeartGold or SoulSilver. The only way to have it in HG/SS is to trade it from either Diamond, Pearl or Platinum.
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 dont get arceus sorry