Oh, I know! I'm not sure how I ultimately incorporated it into my 2 Living Pokedexes (White and White 2). I think I may have obtained them in the Generation 4 GTS--where they were relatively common--and transferred them forward. And yes, any time there is a truly cool event, you can guarantee it won't be repeated!
Ha ha, but that's what makes it a challenge.
Ha ha, but that's what makes it a challenge.