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I've been around Chicago and the suburbs near it. Here's what I've gathered for my play area:
>Instinct
Very few people, kinda like the stereotype. Only about 5% of the players I've met are mean, and they really don't care too much about the gyms. Those that do care are really good though. These people are average in every sense of the word, even when referring to Pokemon knowledge. Not much to say about them outside of them just being average.
>Mystic
There are a good amount, but you don't hear much about them. Many of them are introverts and don't really speak up about their team. Most of them are good at taking gyms, and they usually have good Pokemon knowledge. However, very few people look attractive. About 80% of the team is people with bad habits or awkward body shapes. They don't necessarily smell bad, but they're not people you want to go near save for the remaining 20% that are average like yellow.
>Valor
Valor seems to be the most popular. Most people on Valor are the really good looking people that play the game a lot and are really good at taking gyms. Gyms in the city are usually equal to blue, with Valor being slightly more prominent in the suburbs and blue slightly more in the city. They're very prideful, but because of that they're not the nicest to people on yellow or blue (although maybe 40% are). While they're good looking and good at the game, very many know little about Pokemon and will likely drop the game when Johto comes around.
This is coming from a Mystic point of view.