I have all Black exclusives and have everything caught (from Black) except a couple of the Water catches. I have Pichus, Gastlys, Machops, Magbys, and a couple more trades, and have a deal in the pipeline for three starters from Kanto and Hoenn.
Spare, no. I have both (someone cloned and sent me a flawless Japanese Ditto and a Victini in trading sessions), but until I can get a 3DS Action Replay I am literally stuck with just the single one of each, and can't trade them. I want it too so that I can clone Keldeo for those not able to go to an EB or Gamestop.
I know I could head to Giant Chasm and start hunting down regular Dittos, but I can't find the Japanese ones.