So guys, I've been thinking about this with a friend lately. What exactly is Volcanion anyway?

On the leaks we got yesterday, it was said that he hates the humans. The pokemon we know that hate humans have been CREATED (cf Mewtwo and Genesect). So here is what we think: Volcanion has been altered by Team Flare.

Indeed, Volcanion is said to be venerated in the south of Kalos, which mean he is lots older than Team Flare. Those guys want to destroy the world to build it anew. So they might have been interested in a Pokémon so strong he is known to destroy mountains. So Flare caught him and handed him to Xanthin in the Kalos Power Plant, because they wanted him under control and even more powerful. Flare turned him into a robot trough horrible experiments. In the trailer for the movie, Volcanion makes clear robot sounds, even produce elecrticity, just like a robot.

In the Volcanion XY event, an NPC tells us that he is like nothing he ever saw, something that is not natural.

Remember that girl who said there was a Caldeira Pokemon in Illumis, and pretty much everybody guessed it was Volcanion? Well, it was.
Flare has a HQ in Illumis, so we can guess Volcanion was brought at one time in Illumis and hidden in the sewers for awhile.

So, what do you proTheorists think? Volcanion is a legendary pokemon caught and altered by TFlare in the Power Plant, then was brought to Illumis to be tested as a water heater or something, and that is why he is said to hate humans.