Here are some of the reasons why Deoxys cannot be traded or transferred:
you cant.
If You Want A Deoxys In Pokemon Platinum ,Migrate,Trade,Or Use The Action Replay Pokemon Modifier.
They should be able to trade.
It Is Illegal!!
When you trade Deoxys it becomes its normal form
You have to trade a Deoxys from another Pokemon game to get it on your copy of SoulSilver.
No.
yes
What for? I already have one.
Deoxys is a legendary Pokemon and cannot breed in Pokemon Emerald. This Pokemon can only be obtained through trade and special Live Nintendo events.
You can trade between firered, another leafgreen, ruby, sapphire and emerald also Pokemon colosseum and Pokemon xd gale of darkness.
You have to migrate it ro trade it from another ds Pokemon game that has it.