To coincide with it's reveal, the last Unova region Pokemon, and the current last Pokemon in National Dex Order:Genesect
Genesect's different sprites are not recognized as form differences by the PokÚdex. The same is true for Arceus.
Today's reveal!! - [link]
( 11th July 2012)
(Since the forms are not really considered alternate formes, I've included them in this picture!