Pokémon Rumble U is the third installment in the Pokémon Rumble series. The story involves a Pokémon Toy Shop that sells Capsules containing Toy Pokémon. A number of these capsules are accidentally dropped into a river, which carries them far away. The Toy Pokémon inside decide to find their way back to the Toy Shop. However, their progress is quickly impeded by other Toy Pokémon who are itching to fight.