Question

How do you get Deoxys in Pokemon White Version?

Answer 1

You can't you must trade it from another game

Answer 2

Sorry, but you cannot get it. There was an event that gave you a Deoxys, but that event is long gone, like 3 months I think. The only possible way is through trading. Source: Experience.

Answer 3

Well, there actually is a way to get it. However, you need a Spanish, French, German or Italian version of Black 2 or White 2. (Just saying, that IS a way. :3)
If you actually do have one of these (which I doubt you do) then it's a Wi-Fi event that ends on July 22 that you can get if you have the internet linked to your console.

Otherwise, no. There is no way you can get a Deoxys.
Of course, the GTS is reliable.

Answer 4

There's no deoxys in Pokemon black or white. You won't get access to Deoxys in-game like some other legendaries like Rayquaza or Groudon. Also, the Space Station in Mossdeep City has got nothing to with getting to Deoxys.

You got to go to a Nintendo Event. Sadly, however, very rarely would you see a Nintendo Event that's targeted for those who play the GBA games. Since the new Generation is much more popular and in-demand,you have less chance of finding such Event.

And another thing: You can only get to Deoxys(Nintendo Event) in Pokemons Fire Red/ Leaf Green and Emerald. You cannot capture it in Pokemon Rby/ Sapphire version. To get it, just trade from any FR/LG/E games that has a Deoxys.