I noticed that sometimes after a gym gets taken over the opposing team is able to add multiple Pokémon's without training. How much time is available to add a Pokémon to a friendly gym after its taken over? And do you have to be part of the battle to take over a gym in order to assign a pokemon?
Pokemon-go – Adding multiple pokemons to a friendly gym without training after taking over a gym
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Best Answer
When a gym loses its last defending pokemon, it gets set to zero prestige. Adding a pokemon gives a gym +2000 prestige. It just so happens that the first three gym slots require 0, 2000, 4000, 8000 prestige for the first four pokemon.
So when the first person adds a pokemon, the gym goes from 0->2000, opening a second slot. The second pokemon added makes the gym go from 2000->4000, opening a second slot. The third pokemon added makes the gym go from 4000->6000, meaning 2000 more prestige from training is required to add the fourth pokemon. Time is mostly irrelevant - you just need to get there fast enough (so people on your team don't take the "free" slots 2/3 or other team's don't knock the first guy out)