Dialga and Palkia are like the face of Diamond and Pearl; as representative Pokémon, I thought I would like to have Dialga and Palkia in the title of the movie... and there's no way to do that except with Dialga vs. Palkia, is there? Usually we discuss with the departments above until a title is selected, but this time unlike previous occasions, we unanimously decided to go with the straight, simple, Dialga vs. Palkia.
Dialga rules time, and Palkia rules space, so the scale of the story is large, but, since the design of Dialga and Palkia was that they lived in an alternate dimension, so we decided that their fight in the alternate dimension would affect reality - the world of Satoshi and friends - Dialga and Palkia will appear before Satoshi and friends and drag the city they have arrived at into it as well - in a manner that will raise the question of, if they destroy this city, isn't it possible that they will destroy the whole world as well?
I would also like to involve the main characters' Pokémon in the movie, who we haven't really been able to portray in the past. Not only Satoshi, Hikari and Takeshi's Pokémon will appear in the movie, but there will also be many Pokémon belonging to guest characters. To put in as a single sentence, I would like it to be a very lively movie with a festive atmosphere.