The official Pokémon Global Link website is holding a vote for players of Pokémon Black or Pokémon White to vote for their favorite Pokémon. The vote is being held from November 1st, 2011 until November 30th, 2011. Each Tuesday in November, the current voting results will be posted until the final results are announced on December 13th, 2011. On February 1st, 2011 the winning Pokémon will be available to download on the Pokémon Global Link's Dream World.

vote

Earlier this year, Japan and Korea both held the voting event. Arceus won the vote in Japan while Rekujya won the vote in Korea.

Press Release

Now's your chance to choose a Pokémon that you'd most like to befriend!

Cast your vote by November 30th to help put your Pokémon in the lead! Check back here or at the Pokémon Global Link on December 13th to find out which Pokémon earned the most votes. Starting February 1st, you'll be able to befriend that Pokémon and bring it into your Pokémon Black Version or Pokémon White Version game! You can vote only once, so choose the Pokémon you want to befriend wisely!

Click here to vote!

Source: http://www.pokemon.com/us/news/pgl_pokemon_vote-2011-11-01/