where can I find a ditto in the Giant Chasm in Pokemon black 2
From the forest accessible from the main cave. In tall grass.
It has a 15% chance to appear, at either level 45 or 47.
From my post here.
In Giant chasm. Or Giant chasm Hidden grotto It has 15% chance of appearing in the tall grass and a 10% chance for it to hold Metal Powder There is a 5% chance of seeing it in the hidden grotto and a 1% chance of holding the metal powder in the grotto. They will be at level 45-47.
After entering the Giant Chasm, you can run through the tall and dark grass. It can have a level between 45-51. It has a 15% chance to appear.
you can get it in the tall grass best is dark grass
i got one by my self