ドラえもん The Movie: Nobita's Great Battle of the Mermaid King (映画ドラえもん のび太の人魚大海戦, Eiga ドラえもん Nobita no Ningyo Daikaisen?), also known as ドラえもん THE LEGEND 2010, is a 2010 Japanese animated film that was released on March 6, 2010. This movie is part of the celebration for the franchise's 40th anniversary and it's 30th movie anniversary (映画ドラえもん30周年?).
When Nobita feels like diving in his hometown, ドラえもん uses Underwater ポンプ Simulator (架空水面シミュレーター・ポンプ?) to ポンプ all the water to fill up water. That night, ドラえもん and Nobita use a Diving Mask Simulator to dive underwater. Later on, lots of fish, and a 鮫, サメ attack ドラえもん and his friends. So, ドラえもん puts a stop on the Underwater ポンプ Simulator, but there is a girl named Sophia, lay down on the bushes in his town.