From Bulbapedia, the community-driven Pokémon encyclopedia.
BW Basic Blue (Black & White - Basic Blue) is a Theme Deck from the Pokémon Trading Card Game Online. It predominantly focuses on -type Pokémon. It is one of the exclusive decks available to players without the need for a code from a tangible TCG set and is playable in all game modes.
The deck unlocks cards the first seven times a game is won with it in the Trainer Challenge, until all fourteen cards have been unlocked. All deck unlocks have specific cards which are added, and specific card which are removed.