The Apocalypse Aversion Brigade, sometimes colloquially referred to as just "the Brigade," is led by Alyssa Liok, perhaps better known by her pseudonym, "Riddel". As their name suggests, the Brigade is dedicated to halting the imminent apocalypse by any means necessary.
Although their cause appears to be just and with good intentions, the Apocalypse Aversion Brigade has been forced to go underground. The reasons why they have chosen to remain hidden are murky and difficult to discern, but it's thought that the Lualdi Pokémon League believed them to be disturbing the peace more than maintaining it and threatened them in some way to keep them outside of the media limelight.
According to rumors and broadcasts, the Brigade's base is somewhere in Enghia City.