its ho oh i think
you can't get sinnoh in heartgold.
Pokemon HeartGold Will Have Sinnoh,Kanto,But Hoenn Least Likely.
there are many legendary Pokemon in Pokemon heartgold, but the best is HO-OH
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."
I put a link to a guide all about legendary pokemon in HeartGold in the related links.
Thursday radio