you cant on emerald I'm not sure about any others i hope that helps
impossible without cheating
Actually, you can't get Deoxys w/o cheats. You have to go to a Nintendo event. So even if you try to talk to the guy in the space center(which others say)you can't go to the moon. It's impossible to get Deoxys without cheats.
You can't.
There is no deoxys fossil. To obtain Deoxys in any of the games you have to get it through an event or through cheats.
i did not catch deoxys without action replay it is really easy with action replay
I don't think you can't.
To get Deoxys, you have to migrate from leaf green ruby fire red saphire emerald versions, just to get Deoxys
The only way to catch Deoxys is by going to a Nintendo Event (which already passed), or get Deoxys from a friend who is willing to trade one via Wi-Fi or via Wireless connection.
just trade from someone else
No.
No you can't catch deoxys by using cheats
It's kind hard to get Deoxys without an event, but you can trade. Red, Blue, Yellow, Green, Gold, Silver, and Crystal can't get Deoxys, because the third generation wasn't made that then. You can trade for it through FireRed, LeafGreen, Ruby, Sapphire, or Emerald.