Major appearances
During the events of A Venipede Stampede!, Ash's Pidove evolved into Tranquill after she helped clear a swarm of Venipede out of Castelia City. She later evolved into Unfezant in An Amazing Aerial Battle!.
Other
A Tranquill owned by Trip appeared in A Rival Battle for Club Champ!, which was also the species' debut appearance. 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. It later reappeared in A Venipede Stampede!, where it assisted the effort to clear the swarm of Venipede.
A flock of Tranquill appeared in Purrloin: Sweet or Sneaky?. They were angry at Purrloin for stealing their Berries, until he pleaded for forgiveness so that they would save Ash, Iris, Meowth, the other Pokémon, and his Trainer, Misha, from a sand pit.
Minor appearances
Two Tranquill appeared in Reunion Battles In Nimbasa!, with one under the ownership of Antonio and the other under the ownership of Dino. 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 made cameo appearances in Stopping the Rage of Legends! Part 1.
Two Tranquill made a cameo appearance in Climbing the Tower of Success!, both under the ownership of a Trainer.
Multiple Tranquill appeared in Kyurem VS. The Sword of Justice during the Swords of Justice legend.
A Trainer's Tranquill appeared in Curtain Up, Unova League!.
A Tranquill briefly appeared in Mission: Defeat Your Rival!, under the ownership of Ramone. It was seen with him in front of a Pokémon Center.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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BW010
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Tranquill
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Ash's Pokédex
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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.
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BW022
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Tranquill
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Ash's Pokédex
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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.
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In Pokémon: Twilight Wings
Three Tranquill appeared in Training in the Wild Area.
- Tranquill is the only Pokémon with a base stat total of 358.
Origin
Judging from its Pokédex entries, Tranquill may be based on a dove, often used as a symbol of peace, and possibly 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.
Name origin
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.