yes you can get arceus on any sinnoh game
Pokemon Diamond, Pearl, and Platinum have Arceus.
You can catch Arceus in Diamond, Pearl, or Platinum.
You cannot get Arceus in Pokémon Emerald because Arceus wasn't made for Pokémon Emerald so there is no data for it within the game. Arceus was only made for Pokémon Diamond and Pearl as well as future games.
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.
YOU can not get arceus in any game!
Arceus is only in the game as a statue ( The statue is not Arceus )
yes you can get arceus on any sinnoh game
Pokemon Diamond, Pearl, and Platinum have Arceus.
You can catch Arceus in Diamond, Pearl, or Platinum.
Arceus cannot be found through normal game play. You must get an Arceus from the Arceus event that took place quite some time ago in order to have it in your game.
arceus isn't in that game
No, you cannot get Arceus with or without completing the game. The only way to get Arceus is by a Nintendo Event involving Mystery gift and the Azure Flute.
arceus isn't playable in the game but there is a dungeon where you see a statue of it
NO
no he is not in the game.
So far, no these isn't a way to get Arceus.