where can I find a ditto in Pokemon black 2
Only in the Giant Chasm's forest, where it has a 15% chance to appear. There is also a Hidden Grotto in that location that may hold a Ditto with it's Dream World ability, Impostor.
http://bulbapedia.bulbagarden.net/wiki/Giant_Chasm
Giant Chasm.
Source
How to change your username How to add a user avatar Why was my post hidden? Question etiquette Flags vs Downvotes Anime FAQ Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.