Cheat to get the aurora ticket then go to birth island.
There are sadly no special events to catch Deoxys in Sapphire. You HAVE to trade a Deoxys caught in an event from FireRed, LeafGreen, or Emerald.
You catch deoxys at birth island.
Go to birth island.
you have to get it in a event and you cant get it in Pokemon leafgreen or firered
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Get a Deoxys in Pokemon Emerald, Ruby, Sapphire, Firered, or Leafgreen using the Mystery Gift, and migrate it to your Diamond Version.
Deoxys cause you can't get it.
You don't get a Shiny Deoxys from a man. You'll need to get Deoxys in Pokemon FireRed, LeafGreen, or Emerald. It is extremely hard to get a Shiny Deoxys.
You can't find one you need to trade one from FireRed/LeafGreen/Ruby/Sapphire or Emerald
You need to migrate it from FireRed, LeafGreen, or Emerald. But if you have a Deoxys in Pokemon Ruby or Sapphire, then you can migrate from them to Pal Park.
Go to birth island.
in a island with mistery gift