Team

In Pokmon GO, there are three distinct teams the player may join. These teams include Team Mystic, Team Valor, and Team Instinct. After reaching Level 5, the player can choose a team by tapping on a Gym and advancing through the dialogue introducing each team leader. Each team has is fairly the same, with the coloring of the player's profile and XP bar changing color.

Capturing Gyms
Teams can battle rival team's Pokmon in Gyms. When all rival Pokmon are defeated, players can place their own Pokmon to defend the gym.

Pokemon Appraisal
When a player joins a team, that team's leader will also provide a Pokémon Appraisal system. The information is the same between all three teams, but each team leader has different ways of communicating when appraising a Pokémon.

Changing Teams
Once every 365 days, a player is able to change their current team with the use of a Team Medallion. This item can be purchased through the Shop for 1,000 Pokcoins.

Trivia

 * Prior to version 0.135.0, Trainers were unable to change their team after choosing one.
 * Players can continue to play without selecting a team but will not be able to take part in gym battles.