You cannot get it in an egg, you need to get the Azure Flute in Pearl/Diamond/Platinum from an event/Action Replay. Plus, you need the event Arceus to activate the Palkia/Dialga/Giratina event anyway.
Arceus has never been distributed as an egg. If you are referring to the egg from the HeartGold/SoulSilver Arceus event, it hatches automatically.
You can only get Arceus from Pokemon D/P/Pt.
Yes, in the Shinto Temple he gives you either a Dialga, Palkia, or Giratina egg.
Through cheats
It is an egg, that when hatched, the most powerful Pokemon ever comes out. Arceus. I'm not sure how you got the Arceus Egg because Arceus is a legendary Pokemon.
i am sorry but you cannot obtain arceus in Pokemon heartgold or soulsilver.
Yes you can get Arceus if you have a Pokemon platinum,diamond,or pearl and you have giratina dialga and palkia trade them to your Soulsilver and then a mountain will appear somewhere and then Arceus will be in there
its when you get a dialga palkia or giratina egg
You cannot catch Arceus in Pokemon Soulsilver nor Heartgold, You must either transfer a Arceus from D/P/Ptt or Receive one through the Arceus Event.
Only with hacks
Nope arceus is one of those unobtainable Pokemon along with Shaymin, Darkari,Manaphy
You can't get arceus in Pokemon soulsilver unless you trade from another Pokemon game.