From Bulbapedia, the community-driven Pokémon encyclopedia.
The Tower of Mastery (Japanese: マスタータワー Master Tower) is a landmark in Kalos. It is connected to Shalour City.
In the games
Just like Korrina, the leader of the Shalour Gym, this location appears to have a major role on the understanding of the concept of Mega Evolution.
In other languages