I am leaning towards it being an evolution of Lucario. And here's why.
The title of the new movie is called "The Ruler of Illusion: Z".
The Pokedex entries for Lucario read:
It has the ability to sense the auras of all things. It understands human speech.
By catching the aura emanating from others, it can read their thoughts and movements.
A well-trained one can sense auras to identify and take in the feelings of creatures over half a mile away.
So that kind of plays into the Illusion idea. Perhaps this "Master of Illusion" will have the ability to:
A well-trained one can take the auras, feelings, shape and identity of creatures over half a mile away.
Plus Lucario does wear a mask.
So, based on that, I took my best shot at filling in the silhouette, assuming an evolution of Lucario.
