>>28317858Calling it right fucking now. Type: Null was an experiment to face off against the legendaries by the Aether Foundation, carried out by Team Skull. This is evident by Gladion working under Team Skull, but being related to Lusamine. Gladion and his partner pokemon lent by Aether, Type: Null set off to encounter and capture/defeat the legendary. We probably stop him many times.
Type: Null is a Chimera, made up of different (vague) Pokemon. It's interesting to note that its typing is Normal though. You would think this man-made powerhouse would have a triple typing, right? Well, that's when the mask comes to play. Type Null's mask inhibits its power and speed drasticly, thus being able to keep under control.
Not only does the Chimera and the 'legendary' tier it has back up the Triple typing theory, but in the trailer it is shown to use a somewhat unusual move: Tri-Attack.
When the mask comes off, maybe it gains 3 different typings? Who knows. But we do know it's powerful as fuck.
Thanks other anons earlier for their info on this.