no
Shinto Ruins is only obtainable if you have an Arceus.
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 do not need the National Dex in order to get into the Sinjoh Ruins with an Arceus, all you need is the Arceus and to approach the research building in the Ruins of Alph area with Arceus walking behind you and the researcher will take notice of you and your Arceus and he'll take you inside the Ruins of Alph which is where you'll then be transported to the Sinjoh Ruins.
in Pokemon heartgold ruins of alph in Pokemon soulsilver ruins of alph
unkowns {pokemon}
The Ruins of Alph.
you have to get arceus and go to the ruins of alph and then go to the house
get an arceus and take it to ruins alph
if you got the special Arceus from Toy's R Us you take him as the the first Pokemon of your party and take in to the ruins of alph and the event will begin
No you only catch it in diamond,pearl,and platinum and in soulsilver and heartgold you get an arceus and solve the ruins of Alph.
you have to get arceus from pokemon diamond/pearl and trade it to your heartgold/soulsilver.After you got arceus go to the house in ruins of alph then you will go to the ruins then a light comes out you will go to an old cave then you will see champion cynthia and talk to her than you will go to sinjoh ruins
Nothing in the ruins of alph reaches arceus.