The Aurora Ticket was only obtainable if you went to some Nintendo event several years ago; sorry, no longer possible. :(
find a Nintendo event
You have to do somthing with all three games.
Navel rock to get there you need a mystic ticket. Also you can trade the lugia from Pokemon xd gale of darkness to leafgreen.
special event
Its only obtainable from a Nintendo event which has long since passed.
you really can not get deoxys in Pokemon ruby but you could get a gameshark and hack and i think you need aurora ticket
you have to get the aurora ticket from a Pokemon event in japan. then you give the ticket to the ferry person and he takes you to Birth island.
You can find it at the six island after you get a rainbow ticket from Celio when you give him the ruby from mt.ember when you catch 60 or more pokemon.
Nowhere you must use action replay or gameshark to obtain that item.
deoxys can be found on birth island only by having the aurora ticket.
you should have the mystery gift and mystic ticket to get access to the island's 8 and 9, you will find a lot of rare Pokemon there
Deoxys is a legendary Pokemon which has various different forms. To find one in FireRed version, you need to have an Aurora Ticket.