You cannot, in order to get Deoxys you must trade.
Aurora ticket is only avaible in leaf green, fire red and emerald. But not ruby or sapphire.
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you have to mix records with sapphire/ruby and then you get the ticket!!!!!!!!!!!!
For me i got the Aurora Ticket in the Lilycove Super Mart (Lilycove Department Store) 3rd Floor the lady behind the counter (left lady).she has it on sell for $60000
I don't think you can but if you have Deoxsys on Pokemon fire red leaf green or ruby/sapphire emerald then you can transfer it to your Diamond
You can only mix records between Pokemon ruby, sapphire and emerald not leafgreen.
you really can not get deoxys in Pokemon ruby but you could get a gameshark and hack and i think you need aurora ticket
U have to mix records with your ruby and Sapphire games
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
In Ruby and Sapphire, you cannot get Deoxys without trading it. In Emerald, FireRed and LeafGreen, you need the Aurora Ticket, which is an event item. The only way to get an Aurora Ticket now is by cheating.
You can get two ferry tickets:The ticket for the SS Tidal is obtained by completing the Delta Episode.You can get the Eon ticket by Streetpassing someone with Pokemon Alpha Sapphire or Omega Ruby.
You cannot get the Eon Ticket in Pokemon LeafGreen since it's a key item that is only available for Ruby, Sapphire and Emerald.