In the games
In the anime
In the main series
Celadon Gym appeared in Pokémon Scent-sation!.
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. When Ash found out that the Gym is where the perfume was manufactured, he was visibly shocked.
With help from Team Rocket, Ash, in the guise of "Ashley," gained entry into the Gym. However, Pikachu recognized that it was him, and ThunderShocked him to reveal Ash to everyone in the Gym. After challenging Erika, she accepted his challenge, saying it's against Pokémon League rules to refuse a challenge.
Celadon Gym in Pokémon Origins
Their battle was short-lived due to Team Rocket stealing the perfume. They detonated several bombs for their getaway, setting the Gym ablaze. However, thanks to the Pokémon of Ash, Misty and Brock, the Gym survived. After the fire was put out, Erika gave Ash the Rainbow Badge as a thanks for saving her Gloom from the flames.
In Pokémon Origins
Red was seen visiting the Celadon Gym in the Pokémon Origins episode File 3 - Giovanni. With his Fire-type Charmeleon at a type advantage, Red was easily able to defeat Erika's Grass-type Pokémon, earning himself the Rainbow Badge.
In the manga
In the Pokémon Adventures manga
Celadon Gym first debuted in Meanwhile... Vileplume! in the Red, Green & Blue chapter, where there is a lot of rooms, but one with the Gym Leader Erika has a machine that was used as an experiment to create an Eevee that can change to its evolved forms and back. When Red and Bill finally found Erika they had a 3-3 with Ivysaur, Poliwrath, and Pikachu against Tangela, Bellsprout, and Vileplume which Red lost, but had a trick up his sleeve. Pikachu had used Substitute, making Erika realize that she should heal the Eevee, and she gave Red the Rainbow Badge. It was revealed that there is an archery range nearby that Erika attends daily.
In the TCG
The Celadon Gym was featured in the TCG as both a Japan exclusive Theme Deck and as a card. The following is a list of cards named Celadon City Gym.
- In Generations I and III, Celadon Gym's Gym guide can be found playing the slot machines at the Rocket Game Corner, instead of advising the player on how to defeat Erika.
- In the games, the Cianwood Gym, the Blackthorn Gym, and the Celadon Gym are the only Gyms that require the use of an HM, as part of a Gym puzzle, in order to progress. Cianwood and Blackthorn's Gyms require Strength in Generation II, while Celadon's requires Cut in all generations except Generation II.
- Out of these three, Celadon City Gym is the only not to be in Johto.
- Despite Cut not being required inside the Gym in Generation II, it is required in all Generations to access the Gym itself.
- In Generation III, Picnicker Tina will ask if the player is a peeping tom, even if they are female.
- In Generations I, II, and III, the Gym is shaped like the female gender symbol (♀), representing its all-female population of Gym Trainers.
- In Generation IV, just like in rain, Water- and Grass-type walking Pokémon will feel very happy under the Gym's showers, while Fire-, Ground-, and Rock-type Pokémon will feel unhappy.