Tranquill is an avian Pokémon that is gray with lighter gray and black markings. Its beak and eyes are yellow, and there is a dark pink marking above its beak that curves back over the eyes. It has a black tuft of two feathers on its head and a petal-like arrangement of feathers on the nape of its neck. There is a black stripe on each of its light gray, black-tipped wings. Each pink foot has black talons. It possesses a long tail feather that is tipped in black.
No matter how far a Tranquill travels, it is always able to return to its Trainer and nest. It is said to live in deep forests, where there is a peaceful place without war. Tranquill is said to have an acute memory. It is often used as partners for delivery workers.
During the events of A Venipede Stampede!, Ash's Pidove evolved into a Tranquill after she helped clear a swarm of Venipede out of Castelia City. She later evolved into Unfezant in An Amazing Aerial Battle!.
Tranquill debuted in A Rival Battle for Club Champ!, under the ownership of Trip. It was used in Trip's 5-on-5 battle against Ash; it battled Tepig and Oshawott, defeating the both of them before losing to Pikachu. In A Venipede Stampede!, it assisted the effort to clear the swarm of Venipede.
In Purrloin: Sweet or Sneaky?, multiple Tranquill were angry at a Purrloin for stealing their Berries. He pleaded for forgiveness so that they would save Ash, Iris, Meowth, the other Pokémon, and his Trainer, Misha, from a sandpit.
In Reunion Battles In Nimbasa!, Antonio and Dino own a Pidove each. Antonio used his to advance to the second round in the Club Battle, by defeating Emmanuel and his Scolipede. Dino used his to Antonio's Cottonee and advance to the third round.
Multiple Tranquill appeared in White—Victini and Zekrom and Black—Victini and Reshiram.
Multiple Tranquill appeared in Purrloin: Sweet or Sneaky?.
Multiple Tranquill appeared in Stopping the Rage of Legends! Part 1.
Two Tranquill appeared in Climbing the Tower of Success!, both under the ownership of a Trainer.
In Kyurem VS. The Sword of Justice, the Swords of Justice legend featured multiple Tranquill.
A Trainer's Tranquill appeared in Curtain Up, Unova League!.
In Mission: Defeat Your Rival!, Ramone's Tranquill was in front of a Pokémon Center.
||Tranquill, the Wild Pigeon Pokémon, and the evolved form of Pidove. It is believed that a peaceful place without conflict exists deep in the forest where Tranquill live.
||Tranquill, the Wild Pigeon Pokémon, and the evolved form of Pidove. Tranquill is always able to return to its Trainer no matter how far the distance between them.
Pokémon: Twilight Wings
In Training, three Tranquill were in the Wild Area.
- Tranquill is the only Pokémon with a base stat total of 358.
Tranquill is based on an oriental turtle dove. Judging from its Pokédex entries, may also be a homing pigeon, a domestic pigeon bred to find its way home over extremely long distances. Its design is similar to that of the greater roadrunner or secretarybird.
Tranquill is a combination of tranquil (calm or unstressed) and quill (a feather from the tail of a bird). It also involves quail.
Hatoboh may be a combination of 鳩 hato (pigeon) and 逃亡 tōbō (escape) or 尨 'bō' (shaggy hair). Additionally, some of the works of Kenji Miyazawa mention a fictional ideal world called 「イーハトーヴォ」 Ihatov. The Pokédex entry in Pokémon White says, "Many people believe that, deep in the forest where Tranquill live, there is a peaceful place where there is no war," which might be a reference to Kenji's utopia.