The Hall of Origin is the area where Arceus (The Original One) can be found and caught.
The only way to enter the Hall of Origin is to go to the Spear Pillar and play the Azure Flute (an item only obtainable through events or cheating) on a square near the start of the area. A flight of stairs will then appear and at the top will be a floating platform of glass. Arceus will be waiting for you on the other side of it.
In the hall, you will hear a different song to the one normally heard in the Spear Pillar.
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