I'm not sure how to get a cheat for Aurora ticket, but here is a walk through of how you can get one:
Go to a special Pokemon event. There will only be an Aurora ticket in the Mystery Gift if you have been to a Wonder Spot first. A Wonder Spot is a machine that Nintendo brings to special Pokemon events.
I don't think you can.
You cannot get the Aurora Ticket from Professor Oak. The Aurora Ticket is given to the player by a Nintendo event distribution. These events for the ticket are sadly no longer being held.
You can get the Mystic and Aurora Ticket from a special Nintendo/Pokemon event such as the ones that happened in 2004, but they have expired and no longer can obtain them this way. You will need to use an Action Replay or GameShark to cheat for the Mystic Ticket.
go to www.pokemonruby/cheatsheet.com for some cool codes. [p.s] the only way to get an aurora ticket in Pokemon ruby is to either use an action replay or a gameshark. you cannot trade it from firered/leafgreen because it is a key item.
you must have a gameshark
you cant its a cheat. it brings you to the island where lugia and ho-oh are
Cheat to get the aurora ticket then go to birth island.
special event
To get the tickets you either have to go to a special Nintendo event, or you can cheat with an action replay or game shark.
Unfortunatly, there is no way to get it through normal playthrough without using a cheat device.
Cheat to get the aurora ticket then go to birth island to capture deoxys.
Cheat to get the aurora ticket then show it to the guy who took you to the SS Anne.
I don't think you can.
don't cheat
You must have the Aurora Ticket to go to the island which Deoxys is on. (This ticket can only be obtained by cheat devices and Nintendo Events.) When you get to the island, you will have to solve a puzzle. After that you will face Deoxys.
You cannot get the Aurora Ticket from Professor Oak. The Aurora Ticket is given to the player by a Nintendo event distribution. These events for the ticket are sadly no longer being held.
You must have the Aurora Ticket to go to the island which Deoxys is on. (This ticket can only be obtained by cheat devices and Nintendo Events.) When you get to the island, you will have to solve a puzzle. After that you will face Deoxys.