Luke888 on 31 October 2015
So apparently a new update for the arcade cabinates for Pokkén Tournament has been released and this update adds a new Boss Fight versus a new form of Mewtwo called "Dark Mewtwo".
https://www.youtube.com/watch?v=qk3UynT0K1A
This update seems like a response to all the people who were complaining about the lack of boss fights and, later on, it will probably imply the addition of Mewtwo to the Rooster that currently counts only 10 playable pokémon
