Dota 2 allows for a real time coach to join your team during a match at any time, it's built into the game. They have full vision/information of what your team

Dota 2 allows for a real time coach to join your team during a match at any time, it's built into the game. They have full vision/information of what your team has. However, "Coaching is available in private lobbies, casual matchmaking, and Co-op bot matchmaking, but not Ranked matchmaking, Team matchmaking, or Tournament lobbies."