You can only get Deoxys on Emerald, Fire Red, or Leaf Green. You get the Aurora ticket at a Nintendo event or the Pokemon store in New York if/when they offer it. You use the ticket to sail to birth island (island 9) and catch Deoxys. You can then move him into a Ruby or Sapphire game from the original game.
There are only 2 ways to get Deoxys, one of the ultimate Pokemon. You can either find and go to a special event that can be very far from you (as noted above), or you can use a code breaker or action replay. Anyone who thinks there is another way is sadly mistaken. You CANNOT get him on Ruby/Sapphire without a cheat, or moving him in from a different game.
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No you cannot. Only in Ruby,Sapphire,Firered,leafgreen,Emerald,
just trade from someone else
I found a Pokemon website called Serebii.net, and I also found out that in Ruby and Sapphire. You have to trade from Fire Red, Leaf Green, or Emerald to get Deoxys. So people who post questions about catching Deoxys in Ruby and Sapphire are the real liars. For those of you who posted answers like that. STOP MAKING LIES YOU TWITS!!!:@ :@ :@
the Unobtainable Pokemon in RSEFRLG are Celebi, Mew, Jirachi, Deoxys, and 000 (Missingno. ( DO NOT ATTEMPT TO CATCH))
deoxys didn't exist until generation three (ruby, sapphire, emerald) so is impossible to get in crystal, which is generation two :)