Spoilers Trailer analysis

Not really a theory, but I noticed that Scorbunny left little embers in the grass when he stepped on it, so it’s probably likely that the little yellow pads on its feet and face can make fire or something.

Also, the mines. We don’t know much about them, and this scenario I’m about to explain is highly unlikely, but hear me out- what if they somehow led to the mines in Terminus Cave in Kalos? Both Galar and Kalos are regions based on European countries, and both obviously have mines with tracks and carts and such. Also, the main characters’ style of Sword and Shield reminds me of the style of the Kalos main characters... again, very unlikely, but just an idea I had.