In Pokemon Diamond, Pearl and Platinum. But you have to get the azure Flute. For the azure flute you go to the jubilife tv shop and talk to the reporter. He will ask you two questions on the first one say: Everyone Happy. And on the second one say: Wifi Connection. He will then say that you deserve a mystery gift. Then save and turn your DS off. When you turn it back on under: New Game it will say: Mystery Gift. Click it then it will ask you if you want to receive a gift from a friend WifiConnection or Via WifiConnection click via wifi connection and it will give you the azure flute (if its on the event check every now and then by going to www.Pokemon.com) and then you can get it.
(Right now its the rotom event so you can get the other forms of rotom but i think you can only get the other rotom forms in Pokemon platinum)
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Pokemon Diamond, Pearl, and Platinum have Arceus.
Technically,yes you can get Arceus in Pokemon Heartgold,but only by trading it to your Pokemon Heartgold game from Pokemon diamond,pearl or platinum.
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.
the Pokemon # for arceus is 493
You can't.... Arceus is a 4th generation Pokemon from pearl and stuff while Yellow is a 1st Generation game meaning you can only get the first 151 Pokemon, Bulbasaur to Mew.