It seems that Nintendo is not content to sit idly by while Pokemon Black and White version 2 flies off the shelves on their own due to the popularity of the franchise, as they will be rewarding the people who bought a copy early with a download event, which lets people get the mythical Pokemon Genesect.
The download event will run from October 7 through November 12, where Genesect will be available for free via Nintendo Wi-Fi connection access. According to Nintendo, Genesect was restored from a 300-million-year-old fossil and modified by Team Plasma. The Bug- and Steel-type Pokémon can adjust its power levels based on the enemy it’s facing, and has a signature move called Techno Blast.
Genesect will not be available through normal means (you won’t be able to catch it in the wild), so unless you can hack your gamesave (you cheater!), the only chance you have of getting this nifty legendary is to purchase a copy of Black or White version 2 while the download event is still going on. Remember: you only have until November 12.