Unfortunatly, there is no way to get it through normal playthrough without using a cheat device.
== ==
Get the aurora ticket.
How do you get the Aurora ticket in Pokemon Emerald to get Deoxys Give you every possible way?
Yes if you have an aurora ticket.
you can't it was an even by Nintendo
It is not possible to get Deoxys without the Aurora Ticket for you can only find it on Birth Island.
The ability to get the aurora ticket
By event by Mystery gift anytime
u need gameshark
Need a Aurora ticket to get there.
You need the aurora ticket.
Aurora ticket is only avaible in leaf green, fire red and emerald. But not ruby or sapphire.