let's face it, pokemon "king and queen" or "crown and scepter" are just baseless speculation, let's focus on something that could happen.
let's start from LGPE, in particular let's focus on the museum in Pewter city. on the second floor there is a shuttle (which was already present in the other games), an NPC that talks about space exploration and closely next to it a poster showing the origin of the universe. that poster wasn't present in other games neither was that NPC, so why did they add them?
maybe it's only there for aesthetic purposes, or is it? you'll get to that conclusion, but first let's talk about pokemon's new art director "James Turner", he is a fan of Stephen Hawking's work and if you take a look at Turner's twitter you can clearly see his passion for the sci-fi. in conclusion, there seems to be a pretty strong link between the shuttle and the NPC and James Turner, let's hope for the best.