you can change its formes by going to route 3 and examine the meteorites to change formes.
Top right meteorite - attack forme
Top left meteorite - normal forme
Bottom right meteorite - speed forme
Bottom left meteorite - defense forme
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it does not exist in soulsilver outside of hacks or trades.
You can't catch Deoxys in soul silver
go to Narcene City Museum and on the left there is a meteor press the A button on your DS it will change Deoxys form
You Cant Only In R/S or D/P
Deoxys defense form is found in leafgreen.