If you have Deoxys in the Pokedex, you can find it in the GTS if anyone's trading one.
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If You Want A Deoxys In Pokemon Platinum ,Migrate,Trade,Or Use The Action Replay Pokemon Modifier.
You can use the GTS in Pokemon Platinum after you get the first gym badge from the Oreburgh City gym.
There are a few ways that you could get a shiny Deoxys in Pokemon Platinum. One way would be to get someone who has hacked one to trade.
You have to go into the GTS once
The final deoxys event for Pokemon platinum ended. It was a download mission in Pokemon Ranger Guardian Signs. You had to do it with 4 people. If you have the mission downloaded then you can get a deoxys everytime you beat the mission. Also to be able to play the mission you have to unlock the past missions in POkemon Ranger Guardian Signs.