During Pokémon Get TV 22, the full trailer for the 17th Pocket Monsters Movie was broadcast on television for the first time. It had previously only been viewable at the beginning of select movies in theaters. It was later posted on the official Japanese Pokémon YouTube account.

The Cocoon of Destruction and Diancie Trailer

Source: http://www.youtube.com/watch?v=BN_YzuTez8w