You cannot do anything in Sinnoh in HeartGold. You can only go to Johto and Kanto. Sinnoh is not available to travel to.
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Pokemon HeartGold Will Have Sinnoh,Kanto,But Hoenn Least Likely.
No but you can go to kanto but you can own sinnoh pokemon.you cant
#114 in the Sinnoh Pokedex is Unknown, as in the pokemon. It can be found in the solaceon ruins. Hope this helps!
Cynthia is not the champion in the johto region in Pokemon heartgold,you can't find her in it, but she is the champion in Pokemon pearl,diamond, and platinum versin and that is the sinnoh region.
you can find a dusk stone in the ruins of alpha