It's only in america, so bad luck.
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Yes i think it does, the game has the event programmed into the game even if you dont trigger it with a regigigas. You could even trade a regigigas from D/P to trigger the event.
you need event regigigas
it was an event but i think its over now :(
You must have the event regigigas to open the gate
you gotta get all regis for regigigas and the event for arceus is over.