Exclusive Dream World Pokémon
There are certain Pokémon in the Dream World that you cannot obtain in your respective Black & White games, these Pokémon are most likely to be from the previous generations. You can befriend them in the Dream World and bring them back to your B/W games, however, that doesn´t mean you´ll get them right away. After you have brought the Pokémon down from the Dream World, they will be in certain ares in Isshu and you must then capture them.
Most of the Pokémon in the Dream World have abilities they wouldn´t normally have in the games, thus making these Pokémon very unique. These Pokémon also have a very interesting manner in being obtained, so below is a list of each Pokémon exclusive to the Dream World with their new abilities, how you can obtain them and more!
Daisuki Club - Pokémon Labyrinth
The Daisuki Club launched a new mini-game called Pokémon Labyrinth on July 31st until August 31st, it was only available to Daisuki Club members. Once you have completed the game, you are able to download one of the 7 Eeveelutions. These Eeveelutions have new abilities (For example, a Glaceon with Ice Body.) Once you have synced your Global Link Account to your Daisuki Club Account, the Pokémon will appear in the Dream World.
Pokémon Peer Magazine - 1st Generation Starters
A Japanese Magazine, Pokémon Peer, was released on September 10th, 2010 which contained various information on the new Pokémon Black & White games, however, in this magazine contains one of three passwords that once entered into the Pokémon Global Link, will unlock a Kanto Starter Pokémon who have, like every other Pokémon in the Dream World, special abilities.