To promote the release of the upcoming games Pokémon Black Version 2 and Pokémon White Version 2, the official Pokémon YouTube channel has posted the English dubbed version of the animated trailer that was released a few months ago in Japanese. The version posted also includes the battle scene between the female protagonist's Serperior and Cheren's Stoutland. Below is the video.


Source: http://www.youtube.com/user/pokemon