What about these Vivillion?
The First is a Pokeball Pattern I found whilst searching for pictures of the three unreleased Pokemon which are Diancie, Hoopa, and Volcanion.
The second is the Fancy Pattern,
which will be distributed via the Wonder Card stuff once 100 million Vivillion are traded around the world.
Oops. These have already been talked about. Anyway, Maybe there might be some Pokemon battling competition where the top three winners get the Pokeball one. And also, although off-topic, why can't you find those rare Pokemon when you search on the GTS? If you can capture them, you can trade them. And just saying, but I have a couple Elegant Vivillion I just got from trades that I'm willing to give up. The only one I won't give up is the one someone gave me that has the Ability Friend Guard. I still can't believe that I went on the GTS to look for Scatterbug, and found a Shiny one whose trainer wanted a Beedrill, but by the time I selected my Beedrill, it was gone. Seriously, though, can't it update and remove traded ones during your look? Geesh.
Just a random thought: I wonder what the people in the Philippines, Antarctica (if there is such a Geographical location setting on the 3DS), and the weird Polynesian, Melanesian, and Micronesian islands will get?