The Aurora Ticket was an in-game item, not a physical one. That would of worked with the Eon Ticket, though that has nothing to do with Deoxys. If you want a legit Deoxys, you'll either have to wait for an upcoming event or find an Emerald player with a Deoxys, get him/her to clone it, have him Pal Park it to a 4th generation title and trade it over to you via Wi-Fi. Or, you could find someone willing to trade and trade back a Deoxys and use the data to search for Deoxys on the GTS.