Ash, Pikachu, Brock, May and Max have gotten lost and are out of water. They then come across a water pokemon performance troupe. Also with the group is a Manaphy egg, a leader of water pokemon, and they must protect it from being taken by Captain Phantom, a pirate, and Team Rocket, while escorting the Manaphy to the water temple.
Team Rocket were pretty much only there for breaking the fourth wall and advertising Diamond & Pearl. Aside from that, they didn’t play much of a part since they weren’t the main “bad guy.” Which I didn’t like that much. I love Team Rocket, especially James, so I hate when they aren’t the main “bad guys.” Then there was a weird part at the end that I don’t really want to give away, but it’s obvious when you watch it what it is. It makes absolutely no sense. Then May plays a sort of mom role and Ash and Pikachu didn’t play much of a role at all. Then the voice acting was extremely over done. Then there was some lame cheesiness, especially when it came to Jackie (the Pokemon Ranger).
Anyway, it was probably the worse Pokemon movie (that I’ve watched) yet. It’s also not as if you actually have to watch the movies since they have no effect (affect?) on the series, so feel free to skip.