my headcanon is that it got injured in a expirement at aether and that he holds it in battle as a habit/ to help him concentrate or whatever. It might have something to do with Necrozma though since they both shake and do that weird pose that gladion always does
I'm writing a comic in which a lot of my characters use 'white magic's. What if they were causing the trouble all along? I would basically force the readers to learn to love characters and then reveal their true evil and make them wonder how they could love something so diabolically bad.