Just looked at my Soul Silver, under Mystery Gift, it seems I do have a Jirachi I haven't picked up yet, downloaded on Jun. 26, 2010.
Also a Pikachu-Colored Pichu on Diamond from Feb. 5, 2010, but that's not really special, lol.
That's all I have left, it seems. Probably had something on Heart Gold, but I didn't bother looking before I restarted. :/