The official Pokémon website has announced that new C-Gear Skins and Pokémon Doll Décor items will be available for those that register Pokémon Black Version 2 or Pokémon White Version 2. Below is the news article.

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One Account, Two Games, Six Gifts!

Sync your new Pokémon Black Version 2 or Pokémon White Version 2 game to your existing Pokémon Global Link account to get cool stuff!

Some fun items are on the way for PGL account holders who have registered a Pokémon Black Version or Pokémon White Version Game Card and a Pokémon Black Version 2 or Pokémon White Version 2 Game Card to the same account. If you’ve registered these games by January 17, 2013, you’ll be able to get three Pokémon C-Gear skins for your Pokémon Black Version 2 or Pokémon White Version 2 game, featuring Reshiram, Zekrom, and Victini. And you’ll get three Pokémon Doll Décor items for your Pokémon Dream World home!

Source: http://www.pokemon.com/us/pokemon-news/pgl_3cgears_3dolls-2012-09-27/