Qwilfish is a sea dwelling Pokémon with a spherical body and a flat, paddle-shaped tail. The upper-half of its body is dark teal and the lower half is very light yellow. Its tail is tall and thin with a dark teal outline, light yellow inside, and two dark teal dots in the center. Its eyes are even with its body, and are always seen slanted angrily. Below its eyes are its puffy pink lips. All around its body are sharp, conical spikes, which evolved from scales over time. In order to attack, Qwilfish drinks 2.6 gallons of water to inflate its body. It then uses the water pressure to shoot poisonous quills at its foe. Due to its round body, Qwilfish is not a great swimmer, and when filled with water it is even harder for it to swim.
Qwilfish, the Balloon Pokémon. The quills covering the entire body have evolved from scales. A Qwilfish can cause its body to swell in order to shoot its needles in all directions.
A swarm of Qwilfish appeared in Querulous Qwilfish, angered by pollution that occurred as a result of an accident that occurred during the construction of the Battle Tower. Crystal captured all of them with her skills. Afterwards she found a baby Qwilfish stuck in the toxic waste, which it and the sea were cured and cleaned up respectively. It is unknown if they are still under Crystal's ownership or were released back afterwards.
In order to attack the enemy all over the body with its poisonous sting, the Qwilfish has to take in a lot of water and expand up to several times of its actual size.*
Qwilfish sucks in water, inflating itself. This Pokémon uses the pressure of the water it swallowed to shoot toxic quills all at once from all over its body. It finds swimming somewhat challenging.
A Qwilfish uses the pressure of water it swallows to shoot toxic quills all at once from all over its body. It finds swimming to be somewhat challenging.
Qwilfish is based on both pufferfish and porcupinefish. Its ability to shoot its toxic quills somewhat resembles explosions, which could mean it may have been based on a naval mine.