>>54987664Looking through the other friend areas, the only thing I could find of interest is Treasure Sea, where a sunken ship lies (pic related). It's possible that pokemon built it, as the tech in the ancient lab would suggest humans were an advanced civilization. However, as far as I'm aware, functional boats don't make any appearances in the games, and I don't believe any pokemon mention traveling by boat.
The Decrepit Lab almost certainly isn't just using humans to hype it up as a marketing plot, otherwise there would be so many other opportunities to use it.
Power Plant and Decrepit Labs are both considered "Ruins", likely human ruins