Nintendo is offering even more incentive for fans to pick up their copies of Pokémon Black Version 2 and/or Pokémon White Version 2 when they hit shelves for Nintendo DS on October 7. Those who purchase the game early will get the opportunity to participate in a download event that nets players the mythical Pokémon Genesect.
From October 7 through November 12, Genesect will be available to download for free with Nintendo Wi-Fi Connection access. As Nintendo explains, 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.
I imagine most Pokémon fans will be picking up Black/White 2 on or around day one, so there's plenty of time to grab Genesect between then and November 12.