>>41108965They never explained it. They show the schematics of the device during the credits, but with zero context. My guess they wanted to make him look "badass" and edgy for a final boss, but it just ended up making him look more ridiculous.
This is the one thing that frequently peeves me about Game Freak; the way they like to tease the promise of something more but never following up through on it. It's almost like the games are rushed to meet a ridiculous deadline or something...