Quagsire is a light-blue bipedal, amphibious Pokémon. Its head is broad and round, having little of a neck to distinguish it from the rest of Quagsire’s body. Quagsire’s mouth is wide and its eyes are mere dots, giving it a look of simplicity. Quagsire has a wavy purple coloration on its back and a dark-blue “fin” there that extends to its tail. Quagsire’s arms have three fingers, and its legs have three toes. Like its pre-evolved form, it also resembles real life salamanders commonly known as Giant Salamanders.
Gender differences
The "fin" running down a female Quagsire's back is smaller than that of a male.
Special abilities
Despite being a Water-type Pokémon, Quagsire's Ground element allows it to harmlessly shrug off Electric attacks. Quagsire appear to be oblivious to pain, allowing them to frequently bump their heads while swimming without any adverse effects. It also has the ability to go long periods of time without food, affording it the luxury of waiting for its prey to come to it.
Behavior
Quagsire are quite care-free and relaxed, and so typically swim without paying much attention to their surroundings. Because of this, they tend to bump into boat hulls. Once a year, when the moon is full, wild Quagsire collect round objects like balls and swim to Blue Moon Falls, where they attempt to shoot the balls to the top of a waterfall with their Water Gun attacks to see who can launch their objects the highest, with the apparent target being the moon. The day after, the objects float downstream and are considered to be blessed with luck from the Quagsire.
Quagsire live in extremely clean bodies of freshwater or muddy swamps such as the Great Marsh. The presence of Quagsire in water is usually an excellent indicator that the water is very safe for consumption.
Quagsire hunts for food by leaving its mouth wide open in water and waiting for its prey to blunder in unaware. Because Quagsire does not move, it does not get very hungry.
A Quagsire has also appeared in Training Wrecks, under the ownership of Rocky. Quagsire battled Ash's Pikachu and Grovyle, alongside a Walrein. Before Pikachu could nail Walrein with its Electric Attacks, Quagsire would protect Walrein from being shocked, due to its immunity to Electricity while Walrein's Ice Ball hit Grovyle and Pikachu hard, but after the Ice Ball went slower every turn, Pikachu and Grovyle defeated Walrein and Quagsire.
Lisa had a Quagsire in Spell of the Unown, and used it to battle Ash against his Pikachu. After Pikachu landed on the head of Lisa's Quagsire head first, both Pokémon fainted.
A few Quagsire are also seen with many other Pokémon in Got Miltank?.
Quagsire, the Water Fish Pokémon. The Quagsire makes its home in clean freshwater lakes. The Quagsire is covered by a slippery layer of skin, making this Pokémon especially difficult to handle.
Quagsire, the Water Fish Pokémon and the evolved form of Wooper. Known as quite dim-witted, it doesn't care when it crashes its head against rocks or the bottoms of boats.
Quagsire, the Water Fish Pokémon. Quagsire has an easy going nature and doesn't care if it bumps its head on boats and boulders while swimming.
In the manga
Crasher Wake's Quagsire as seen in Pokémon Adventures
Pokémon Adventures
Quagsire is first seen as one of the Pokémon Crystal captured and sent to Professor Oak via the Portable Transfer System. She remarked that she found it on Route 32 and was "a tad stronger than I expected."
Quagsire hunts for food by leaving its mouth wide open in water and waiting for its prey to blunder in unaware. Because the Pokémon does not move, it does not get very hungry.
Quagsire's Crystal Pokédex entry states that it doesn't care if it bumps its head, but its phrases in Mystery Dungeon state it saying it will try not to bump its head.
Despite Quagsire's Pokédex entry from Ash's Pokédex in Once in a Blue Moon stating that Quagsire live in fresh, clean, drinkable water, Quagsire appear in the Great Marsh and Route 212, a marshy area.
Quagsire's name is a combination of quagmire, and the honorific sire. Siren might also, but not likely, be involved. Its Japanese name may be a combination of 沼 numa, swamp, marsh, pond, or lake, and 王 ō, king, or オオサンショウウオ ōsanshōuo, Japanese giant salamander.