Flotsam, Akio, Less and Matt are in the Pokémon Center in Rieva together. Matt just called Mark (as I mentioned in the Recruitment thread the Pokédexes have texting and phone functionality) to ask him to come visit, but Mark is ahead of you (and everyone else) timeline-wise so he’s telling Matt he will come by later, after you have caught up.
Yes, or at least that was my read of his last post.