you get it from jirachi
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No idea. Have not heard of any 'Black Orb', ever, until now.
There is not such item called "black steel orb".
In black and white, if you ever get the legendary Pokemon Palkia, Dialga, and Giratina, you can give them the orbs, and they'll be stronger.
You can´t find it on Emerald
trade from dpt