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.
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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