Go to the safari zone when you are able to customize the safari zone and go to the rocky beach and go through the grass until you have found a doduo bird.
I hope I haved helped!
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You can find doduo either at the safari zone or you can find it at cycling road.
no you can trade soulsilver pokemon to black
Doduo evolves into Dodrio at level 31. http://www.serebii.net/pokedex-rs/084.shtml
You can only get it from certain wild Pokemon which are Fearow, Doduo, and Dodrio which have a 5% chance of having the item. So either catch them and see if they have one or use a Pokemon with thief to steal a item from the opponent. The other method is trading a Pokemon with the sharp beak from HeartGold or SoulSilver which you get it in that game from Monica of Monday.
talk to dawns sister in sangem town,she might say there are doduo at route 201 dawn or lucasue which there one ( i have lucasue)