sadly, there isn't one. Only in diamond and pearl.
Yes there is new moon island, hall of origin.
If you mean hall of origin, it's not in any gba game. It's only in platinum, pearl, and diamond.
NO. YOU CAN GO THERE ONLY WITH AZURE FLUTE
You must obtain the event item Azure flute from an event, or use a cheat.
you don't. to get the azure flute you currently need the action repplay. the aardvarks are coming
Arceus can be encountered in the Hall of Origin in Pokemon Diamond, Pearl, and Platinum. The Hall of Origin is an event-only area that is located above the Spear Pillar. It is accessible only after the player has obtained the Azure Flute and entered the Hall of Fame.
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You have to beat the Pokemon League.
The Hall Of Origin
hall of origin
In the concert hall to the left