Dialga vs. Palkia vs. Darkrai. This is the first movie for Diamond & Pearl, so I wanted to include Dialga and Palkia. So the title chosen then could only have been Dialga vs. Palkia. But this time we added another Pokémon, Darkrai, which is also making its debut, so we ended up deciding to include all three in the title. Dialga vs. Palkia vs. Darkrai... There's nothing else but this, is there?
Darkrai is a Darkness Pokémon, but, one cannot know what it really is like. It could be an evil Pokémon, and it could be a good Pokémon. It is a Pokémon that holds the key to the movie this time: Will it be an ally to Satoshi and friends, or will it be an enemy - one can't tell from the beginning. That's all I can say at the moment.
Dialga is a time-ruling Pokémon, and Palkia is a space-ruling Pokémon. The two them live in a dimension that is completely different in terms of space and time, and by some chance they end up meeting each other. A conflict arises as a result of that. The biggest theme in Pokémon is communication. Communication is not just understanding each other, but also mutually accepting the differences and existence of the other when one type of person meets another type of person. This time, how will Satoshi and friends calm the conflict between Dialga and Palkia, two Pokémon which should not and must not meet..? Ultimate communication (究極のコミュニケーション) - that is the theme of the movie this time. I think that it would be nice to illustrate this most important theme of Pokémon in the movie.