In the English dub, Darkrai is referred to as a male, even though Darkrai is genderless in the games
The sound that Palkia makes in this film is derived from the sound of Boga the Varactyl from Star Wars: Episode III - Revenge of the Sith (2005). Here, it is also mixed with sounds that Godzilla (Godzilla (1954)) and King Ghidorah (Ghidorah: The Three-Headed Monster (1964)) make.
The most recent Pokemon film to peak at the weekend box office in Japan.
The Shellos that appears in the movie is in their East Sea form. According to a recent map of the anime, Alamos Town is actually on the western side of Mt. Coronet, although it is unknown whether or not the Shellos was from Alamos Town.
This is the first Pokemon movie to be rated PG in the United States and the first to be rated in the United States at all since Pokémon Heroes (2002).