Arceus doesn't exist in gold i believe. I've never seen it in gold, however.
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Where ever you find normal Arceus. :p
You have to trade it from Pokémon Pearl, Diamond or Platinum.
Arceus awakens the Pokemon you Choose, Palkia, Dialga or Giratina. The egg hatches during the event, and that Pokemon joins your party. It is Lv. 1.
Impossible since its a 4th generation pokemon.
the Pokemon # for arceus is 493