I've forgotten to mention this, but in the streams of the newly airing Pokémon episodes, I've seen a commercial for a World Coronation Series toy set, complete with a battlefield and figurines. And in the commercial, it's a Lucario figurine vs. a Charizard figurine, with the Lucario Mega Evolving and the Charizard Gigantamaxing. Foreshadowing on Lucario's part, perhaps?
I would laugh (and cry) if Korrina gets yet another appearance in Pokemon JN before any of the Kalos crew even get a single mention since Pokemon M20.