多啦A梦 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 多啦A梦 Nobita no Ningyo Daikaisen?), also known as 多啦A梦 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, 多啦A梦 uses Underwater 泵 Simulator (架空水面シミュレーター・ポンプ?) to 泵 all the water to fill up water. That night, 多啦A梦 and Nobita use a Diving Mask Simulator to dive underwater. Later on, lots of fish, and a 鲨鱼 attack 多啦A梦 and his friends. So, 多啦A梦 puts a stop on the Underwater 泵 Simulator, but there is a girl named Sophia, lay down on the bushes in his town.