To make the stairway appear you need a special key item called the azure flute. It can be obtained from a Nintendo wi-fi event.
you need to go to a Pokemon event to get the item hope this helps
no you can use any as long it is a special event one
You don't need a special Arceus for the Sinjoh Ruins event in HeartGold/SoulSilver, you can use a regular one that you caught in the Hall of Origins as well.
Did you have the Arceus gotten via the special Diamond, Pearl, and Platinum? If not, that's why it wont work. You need the special event Arceus. If you're using the correct one, I dont know what to tell you (I didn't get the event Arceus either).
no it was brought into the game in diamond because u need a special event to get it on diamond
No. There was a special Arceus event that could be used to get an Arceus , but if you didnt do that, you must get an action replay, or get the the azure flute via mystery gift for Diamond, Pearl, or Platinum. Bear in mind that if you did not do the special 12th movie Arceus event, you can only get one of the Dialga, Palkia, or Garatina that comes out of this event. But also keep in mind you dont have to catch all the legendarys in heart gold to do this event.
You need to get it by a special Nintendo event or if you have a action replay and it is not called the arceus flute I am pretty sure it is called the ASSURE FLUTE.
You need the azure flute to attract arceus, but you must obtain this item from an event. Find a close gamestop and ask them for it.
You need arceus event
You will need the event item Azure Flute. The Azure Flute opens the way to the Hall of Origin where Arceus is once you get to Spear Pillar.
It's impossible. There's been no event for the Azure Flute, the item you need to get Arceus in the first place.