The official Pokémon site has revealed the mythical Pokémon Keldeo and has updated with information on its distribution. This Keldeo is identical to the one given out to Japanese players of Pokémon Black and White and Pokémon Black 2 and White 2 and will be distributed in-store in America and Europe to players of Pokémon Black and White. More specifically:

• In the United States, Keldeo will be distributed in GameStop stores from August 27th to October 6th.


• In the United Kingdom, Keldeo will be distributed in Game and Gamestation stores from September 1st to October 11th.


• In France, Germany and Spain Keldeo will be distributed in participating stores from September 1st to October 11th.


• In Italy, Keldeo will be distributed in GameStop stores from September 1st to October 11th.

When Keldeo is transferred to Pokémon Black 2 and White 2 and players visit a field close to Floccesy Town with this Pokémon in their party, Keldeo will be able to learn its signature move, Secret Sword. This will enable it to change from its Ordinary to its Resolute Form, thus gaining a new appearance. If the move is deleted or Keldeo is transferred back to Pokémon Black and White, it will revert to its Ordinary Form.

Press Release

DISCOVER THE NEW MYTHICAL POKÉMON KELDEO - Limited-Time Distribution of the Colt Pokémon Keldeo at GameStop Stores Nationwide

BELLEVUE, WA-August 20th, 2012-Beginning August 27th at GameStop stores nationwide, Pokémon fans can receive the newly discovered Mythical Pokemon Keldeo in their copies of Pokémon Black Version or Pokémon White Version. This colorful, incredibly powerful Fighting- and Water-type Pokémon cannot be caught during normal gameplay, and this GameStop distribution is only for a limited time. Once players receive the Original Form Keldeo in their game, it can be transferred into the new Pokémon Black Version 2 or Pokémon White Version 2 games, arriving in stores on October 7th. In the new games, players will be able to play out a cool scenario that not only transforms Keldeo into a new form but also teaches it its signature move!

Because the Colt Pokémon cannot be found during normal gameplay, this distribution is the only way Pokémon players can receive it at this time. During the distribution period, August 27th through October 6th, Pokémon fans can bring their Nintendo 3DS or Nintendo DS system and a copy of Pokémon Black Version or Pokémon White Version to GameStop and receive a Keldeo that knows Aqua Jet, Leer, Double Kick, and BubbleBeam. As a Fighting- and Water-type Pokémon, Keldeo excels at moves that are super effective against seven different Pokémon types: Normal, Fire, Ice, Ground, Rock, Dark, and Steel.

Powerful in its own right, when transferred into Pokémon Black Version 2 or Pokémon White Version 2, Keldeo will learn its signature move, Secret Sword, and transform into Resolute Form, a new look that features a more prominent horn on its head. Secret Sword is a Fighting-type move, well suited to Keldeo's high Special Attack stat. And, because Keldeo can learn this move from the very first stages of Pokémon Black Version 2 or Pokémon White Version 2, it will be a powerful ally as you continue your adventure.

Sources:
http://www.pokemon.com/us/pokemon-news/vg_keldeo_reveal-2012-08-20/
http://www.pokemonblackwhite.com/pokemon-black-and-white-1/en-us/pokemon/get-keldeo/
http://www.pokemonblackwhite.com/pokemon-black-and-white-2/#en-us/story/keldeo
http://www.pokemonblackwhite.com/pokemon-black-and-white-2/#en-us/story/keldeo/details-keldeo-extended
http://www.pokemonblackwhite.com/pokemon-black-and-white-2/#en-us/pokemon/keldeo

the OT for it Will be

SMR2012 (English/German)
EST2012 (Spain/Italy)
ETÉ2012 (France)

and the ID: 08272

Why another in-store event?... Wait, of course we know. Have people pre-order the game at those stores *sigh*