You can't. Deoxys Only comes as an event Pokemon in Pokemon Ruby, Sapphire, and Emerald. You would get a ferry ticket to Birth Island to catch it. There was also an event for Pokemon Diamond and Pearl for a Lvl. 50 Deoxys from GameStop.
Hope I helped out a bit!
you can only get Deoxis through special distrabution events, cannot obtain through regular gameplay.
In sapphire you cant catch it without events or cheats:-)
You can only get deoxis in earlier versions of Pokemon; emerald ruby sapphire. The event for deoxis ended years agao. PS: Its April 2009 when wrote
Deoxys is only obtainable in Nintendo Events. The most recent one in the US was the Game Stop Deoxys event.
There is no deoxys
Certai pokemons that come from events are not needed to complete the pokedex. Such as: Arceus Mew Deoxis Manaphy etc...
Nope.
You can't get him without events or cheats. For Darkrai, Manaphy and Arceus you need a event to capture him.
To get Deoxys in any of the games, you would have needed to go to an event. Unfortunately, these events are already over.
1. Catch it in a Pokémon GBA title with an event and migrate it to Pearl.
buy one of eBay
Nope.