QUAGSIRE

While Ash and his friends were resting near Cherrygrove City, the GS Ball they were carrying was taken by a Quagsire. The local Officer Jenny explained that all the Pokémon was doing was taking it to Blue Moon Falls for an annual celebration.
Ash, both intrigued and eager to get the Ball back, decided to investigate this further. Later, he and his friends stumbled across Blue Moon Falls. They witnessed hundreds of Quagsire with round-shaped objects. At midnight, they tossed the objects into the air and used Water Gun to send them over the falls. The following morning, all the objects, including the GS Ball, floated safely back down stream.

Quagsire
is a light blue, bipedal, amphibious Pokémon. Its head is broad and round, having little neck to distinguish it from the rest of its body. It has a wide mouth and tiny, black eyes. A wavy, purple stripe runs down its back. Along its spine is a dark blue fin, which is larger on the male than on the female. Quagsire 's hands and feet both have three digits. Its outer layer of skin is slimy and slippery. Quagsire shares many similarities with its Paldean relative, Clodsire.
Quagsire is carefree and sluggish by nature, although it is protective towards Wooper. An unintelligent Pokémon,it tends to bump its head inadvertently while swimming and seems not to care. It hunts for food by leaving its mouth wide open in water and waiting for its unaware prey to blunder in. Because Quagsire does not move, it does not get very hungry and can afford to wait for its food.
As shown in Pokémon Sleep, Quagsire leaves its mouth open even as it sleeps. It is said seeing a Quagsire asleep with its mouth wide open is a sign it’s possbily waiting for prey, while it dreams. Quagsire lives in clean bodies of freshwater, as well as muddy swamps. During the day, Quagsire avoids sunlight by submerging itself in the water.