ill give you almost any legendary for a pikachu colored pichu or celebi just name it and ill tell you if i have it.

I just happen to have a 10th Anniversary Celebi(brought it over to my Platinum from Emerald)...was used a bit, but not seriously...mostly got it at the 10th Anniv. event some time ago as I'm very partial to Grass and Electric types....

...speaking of which, if you've got a Raikou(legit, if at all possible), I think I could be convinced to let go of the Celebi! :D

Toss me a message later and we'll see what we can do.