Theory: Duraludon is a Paradox Haxorus

SuperSkyShaymin

I think Duraludon could easily actually be a paradox Haxorus. I mean, just look at it. It totally looks like a robot from the future. And it's part Steel type, which fits with the "Iron" theme of the future Paradox mons. Game Freak has been hiding a secret paradox Pokemon right under our noses this whole time.

Tacolaser

But Duraludon can evolve. No other paradox pokemon can do that.