Get Ready for Halloween with Banette!
Get the Ghost-type Pokémon Banette for your Pokémon Black Version or Pokémon White Version game! Look in the October issue of Nintendo Power magazine to find a special password,
NPCHARACTER. Using it will let you befriend Banette with Faint Attack, Shadow Ball, Hex, and
Cotton Guard at the Pokémon Global Link. Banette will be available for only a short time, so be sure to pick up the October Nintendo Power to find the password today. Visit the Promotions page once you have the password to receive Banette! Happy Halloween!
Source:
Pokémon Global Link