Forum: gaming.stackexchange.com
Tags: <pokemon-go>
Title: Is it possible to put more than one Pokemon in a gym?
Question: Is it possible to deploy more than one Pokemon in a gym? And how many gyms can you be in?

Answers:
sents: text: You can be in as many as 10 gyms at once, but you cannot employ more than one of your own Pokémon at a single gym.
text: However the higher level a gym
text: the more Pokémon that others can deploy at that gym as well.
answer_details: author: gaming.stackexchange.com/users/154784/Kevin Tian
score: 11
sents: text: Gyms can hold up to a certain amount of pokemon depending on their gym level.
text: For example, a level 7 gym can hold up to 7 pokemon, however each trainer can only have one of their own pokemon on any given gym.
text: To get more pokemon at a particular gym, you must first level up that gym to increase it's defending capacity, then wait for other people in your faction to place their pokemon at that gym.
text: You can have 1 pokemon in an unlimited number of gyms, but the maximum defender bonus you can collect from owning gyms is 10.
text: For example, if I had pokemon posted at 15 different gyms, I could at most collect 100 pokecoins and 5000 stardust every 21 hours.
answer_details: author: gaming.stackexchange.com/users/155432/Joey Hoang
score: 9
sents: text: The gym mechanism has changed drastically since Pokemon Go first launched, so here is an updated answer for the new mechanics: Is it possible to put more than one Pokemon in a gym?
text: In a single gym, no , you can only put one Pokemon per Gym.
text: But, you can have up to 20 Pokemon defending different gyms.
text: Some other things to keep in mind: Gyms only have 6 slots for Pokemon.
text: If all the slots are taken, the button to add a Pokemon will not appear.
text: You can only put Pokemon in either neutral (grey) Gyms, or gyms of your team colour
text: i.e. Red (Team Valor), Blue (Team Mystic) or Yellow (Team Instinct).
text: You will need to battle and knock out Pokemon defending a gym of a different colour in order to return the gym to 'Neutral' status and add a Pokemon of your own.
text: Pokemon are knocked out when their Motivation (CP Heart) reaches 0.
text: You may need to battle multiple times to knock Pokemon out of the gym.
text: Gyms will only allow a single Pokemon with the same Pokedex number.
text: For example: You can't add a Charmander when there is already a Charmander defending the gym.
text: This includes alternate forms and costumes - you can't add both a Raichu and an Alolan Raichu to the Gym Note that Pokemon evolutions don't share a Pokedex number, you can add your Charmander when there is a Charmeleon or Charizard on the gym.
text: The Gym's 'battle order' is based on the order in which you added a Pokemon.
text: First Pokemon added, first to battle, and potentially the first to be knocked out.
text: You can earn coins for leaving Pokemon in Gyms.
text: Pokémon accumulate one PokéCoin per 10 minutes when they're in a Gym.
text: You can earn a maximum of 50 coins per day.
text: Coins are awarded when your Pokemon is knocked out of a gym Sources: Personal Experience imore.com - Pokémon Go Gyms: How to defend, attack, earn coins, get stardust Pokemon Go Wiki - Gyms
answer_details: author: gaming.stackexchange.com/users/28182/Robotnik
score: 5
sents: text: You can only have 1 of your own at a gym.
text: Once it has been defeated you can take the gym back and add the same or a new one.
text: You can add as many Pokemon to different gyms as you like
text: but you only get the "defense bonus" from 10 gyms.
answer_details: author: gaming.stackexchange.com/users/152051/Virusbomb
score: 3
sents: text: You can only have 1 per gym.
text: You can have as many gyms as you want.
text: That being said, each gym has a base level.
text: One Pokémon per per level.
text: You level a gym up by training on it.
text: It is based purely off of prestige.
text: So if a gym is level two with 4k/8k...i believe you have to get the gym to 8k prestige before it's level 3 and another Pokémon can be placed there.
answer_details: author: gaming.stackexchange.com/users/155578/grepsedawk
score: 1
sents: text: One Pokemon per gym.
text: Unlimited gyms.
text: More gyms = more stardust and coins from your gym reward which you get from the shield icon in the shop.
answer_details: author: gaming.stackexchange.com/users/155412/galleek
score: 0

Summary of the answers:
There is only 1 Pokemon employed per gym. 
Whereas many people say you can have one per gym, you can only have as many as the level of gym allows.