Celadon City (Japanese: タマムシシティTamamushi City) is located in central Kanto. It is the most populous city in Kanto and the eighth most populous in the Pokémon world, surpassing even Saffron City in the east. The city has two entrances, one from the east via Route 7, and one from the west via Route 16.
Celadon's department store is the largest building in the city, as well as the largest shop in Kanto. It is located in the northwest corner of the city. The store has two sliding door entrances, and is six stories high, including a rooftop floor.
In the Generation I games and Pokémon FireRed and LeafGreen, the player can find a Poké Ball containing an Eevee here. Game Freak has an office in this building, where the player can receive a diploma from the lead developer if they have completed their Pokédex.
The Celadon Game Corner is located in the southeast of the city. It was originally run by Team Rocket, being known as the Rocket Game Corner while under their management. The Team Rocket Hideout is located underneath it; the staircase to the base is revealed by pressing a switch hidden behind a poster.
In the Generation I to IV games, the Game Corner consists of two adjacent buildings: the Game Corner proper (the larger building on the west) and the Prize Corner (the smaller building on the east). The main building contains the casino itself, where the player can earn coins; the Prize Corner is where the player can exchange coins for prizes, including Pokémon, TMs, and other items. In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, the Game Corner is one building with two entrances; the space on the west side contains the arcade while the space on the east side is just a sitting area.
In Generation IV, there is a man in the Prize Corner building who can tell the player the type of their Pokémon's Hidden Power.
The Team Rocket Hideout is an underground four-floor-deep complex beneath the Rocket Game Corner. The Rocket Hideout is accessed by pressing a switch behind a poster in the Game Corner in Celadon City. In the GenerationI, III, and VII games, the player must go into the underbelly of the Game Corner and defeat Team Rocket.
The Celadon Hotel is a luxurious hotel building located in the southeastern part of the city. The player is not able to rent a room due to all the rooms being booked. The hotel's layout is remarkably similar to a Pokémon Center.
In Pokémon Red and Blue (but not Pokémon Yellow), there is an invisible PC in the hotel; it is speculated that this is an oversight that occurred due to the interior of the hotel being created by copying a Pokémon Center, but the code that allows the player to activate the PC at that position was mistakenly not removed.
In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, on the left side of the Pokémon Center is a Channeler called Madam Celadon with her Abra. For 10,000, Madam Celadon can influcence the Nature of wild Pokémon they encounter for the rest of the day. The Nature is determined with two questions; the first question determining the Nature's strength, and the second determining its weakness. The following chart describes the possible results.
The Celadon Gym is a garden full of Trainers. It is impossible to reach Erika without fighting at least two other Trainers and using Cut. In all versions and adaptations of Pokémon, Celadon Gym is consistently rendered as a greenhouse.
In the anime, Celadon Gym appeared in Pokémon Scent-Sation!. Attached to the Celadon Gym is a perfume shop, run by Erika herself. Ash wanted to challenge Erika to a Gym battle, but the workers at the Gym refused to allow his entry because he had earlier criticized a perfume shop, saying that all they do is turn men into zombies. They kicked him out of the shop for insulting them and when Ash found out that the Gym is where the perfume was manufactured, he was visibly shocked.
The population of Celadon City is 82 (72, excluding the Team Rocket members in the Rocket Hideout), making it the largest city in Kanto, beating even its skyscraper-clustered neighbor Saffron City. Celadon City's large population is partly due to the Department store and the Team Rocket Hideout.
Between Generation I and III, there have being some little and unnoticeable changes to Celadon City. Mostly, there are only aesthetic changes between building designs. A fountain has been added to the western side of the city. The small pond in the center of the city now has small hints of pollution, with Grimer and Koffing appearing on rare occasions, as an allusion to the previous generation.
In Generation II, Celadon City has changed quite a bit. Some buildings have been removed and some have been added. There is a café located on the eastern side of town, and the Department Store has been moved the far western side of town. Over the course of two years, the small pond has grown very polluted; only Grimer and Muk can be found there. Like Generation III, Generation IV has the added fountain to the western side of the city. The central pond has been extended southward with a bridge going across it.
Ash and his friends arrived in Celadon City in Pokémon Scent-sation! so that Ash could challenge the Gym Leader, Erika. She initially refused to battle him due to the fact that he offended her by insulting her perfume, so Ash sneaked into the Celadon Gym disguised as a girl and answering to the name "Ashley". When Team Rocket's interference caused a fire to start inside the Gym, Erika's Gloom was trapped inside. Ash saved the Pokémon despite its stench, and Erika awarded him the Rainbow Badge for his courage.
Ash and his friends briefly revisited Celadon City in The Punchy Pokémon after they just left it. Although it is not mentioned in the episode, according to official art for the P1 Grand Prix from the Game Freak website, the P1 Grand Prix takes place in the Celadon City Hall.
Red was briefly seen visiting Celadon City in File 3: Giovanni. After defeating Erika and earning the Rainbow Badge, he followed a "suspicious-looking guy" to a place that turned out to be Team Rocket's secret hideout. There, he released several Pokémon imprisoned by Team Rocket and had his first encounter with the leader of the organization, Giovanni.
Celadon City first appeared from Wartortle Wars to Meanwhile...Vileplume!. After being fooled into buying a lot of expensive items, all of which later turned out to be fake, from Green, Red encountered her again trying to sell her items to the people of Celadon. Upon noticing Red, she tried to get away with her Wartortle, but was stopped by Red and his Snorlax. When Red later went to spend night at the Celadon Hotel, he was enraged to find out that Green had secretly stolen his Boulder and Cascade Badges.
After having an encounter with Team Rocket and Mew, and supposedly recovering his Badges, Red encountered Erika, the Celadon City Gym Leader. She offered to accept Red's challenge for a battle if he caught her an Eevee. With the help of Bill, Red soon found an Eevee, but it turned out to be a modified Eevee, capable of changing into it evolutions and back. After catching the Eevee, Red learned from Erika that the Eevee had been tested by Team Rocket, and she had wanted to test Red if he'd be a good ally in a fight against the evil organization.
Yellow ended up in Celadon City after having escaped from Lorelei, and was greeted by Erika and several of her students. Super Nerd Miles, sent to capture Pika by Agatha, then appeared, disguised as Red. He knocked Erika out, overwhelmed Yellow, and tried to escape with Pika, but was stopped by the four "Gym Leaders of Justice". Agatha's Gastly then tried to kill Miles, but was stopped by Blue. Afterwards, Blue and Yellow left to train together at Route 9.
Later in the chapter, Celadon City was attacked by an army of Shellder and Cloyster, sent by Lorelei. While protecting her Gym, Erika found out that the Elite Four were after her Badge. After Yellow defeated Lance at Cerise Island, the Pokémon army lost its strength.