Note: This review is based off of seeing the movie on TV, when it was shown on Cartoon Network. As such, I can't comment on DVD features, only the movie itself.
The latest Pokemon movie continues a trend of steady improvement that the Pokemon movies have been showing for the past four or five. This movie, the eleventh, chronicles Ash, Dawn, and Brock's adventures with the legendary Pokemon Shaymin.
The story covers the existence of a Reverse World where the legendary Pokemon Giratina lives, and its connections to the real world. The villain seeks to exploit Giratina and those connections, theoretically for noble purposes; realistically out of sheer madness. The heroes and Shaymin get caught up in the mayhem. The story is not on its surface incredibly complicated, which is a plus considering the intended audience, but there are also some wider themes present if one is looking for them.
Visually, it's mostly standard anime fare; however, there are plenty of scenes that are quite impressive, especially the attacks of the Pokemon, the portals to and from the Reverse World, and one of the villain's weapons later on in the movie.
However, the movie started to feel like the Shaymin Channel after a while. If anyone wants to know what moves Shaymin can use and the details and limitations of Shaymin's Sky Form, all you have to do is watch the movie. I found it to be somewhat irritating after a while, simply because I would have preferred that they spend the time on the story or its characters rather than put so much of a focus on Shaymin, although that's merely a personal preference.
In summary, it's a fine movie, and certainly worth watching. It's not perfect, what with the over-focus on Shaymin. But it's easily deserving of four stars, and I think it to be an interesting movie for anyone, fans of Pokemon or not.