if you got the special Arceus from Toy's R Us you take him as the the first Pokemon of your party and take in to the ruins of alph and the event will begin
you can't get sinnoh in heartgold.
Pokemon HeartGold Will Have Sinnoh,Kanto,But Hoenn Least Likely.
You cannot do anything in Sinnoh in HeartGold. You can only go to Johto and Kanto. Sinnoh is not available to travel to.
no
you simply cannot
Duskull is a Sinnoh pokemon as in pokemon platinum you get darkrai which is the evolution of duskull.
You don't you have to migrate to get sinnoh pokemon.
you cant get to sinnoh in heart gold, but you can find the gym leaders from sinnoh.
You cannot go to the Sinnoh region in "Pokémon HeartGold" and "Pokémon SoulSilver."
Thursday radio
unfortunately, you can't
No Sinnoh Pokemon can be found in HeartGold or SoulSilver, but you can choose just one of the Hoenn Pokemon after doing certain things (either Torchic, Mudkip, or Treecko).