Yes if you complete a puzzle in one of the buidings you go underground you can find UNOWN and capture them and if you speak to one of the people aboveground they will give you an UNOWN Report to regisster the types of UNOWN in.
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You cannot do anything in Sinnoh in HeartGold. You can only go to Johto and Kanto. Sinnoh is not available to travel to.
you can find a dusk stone in the ruins of alpha
You can get natu at the ruins of alph in heart gold and soul silver
(This counts as Pokemon HeartGold and Soulsilver)To get a moon stone you have to get it from moms savings in new bark town,ruins of Alph(bottom right ruins) In Kanto you have to get it from Mt.Moon (Monday nights only)or Tohjo falls.new bark town (moms savings) ruins of alph and mount moon
There isn't a date for the Arceus Event in Pokemon HeartGold (unless you mean the event where you get Arceus). When you send over any Arceus into your HeartGold game, the event is activated. You'll have to go to the Ruins of Alph in order to do the event.