Merging the boutiques (if customization is confirmed) and the marts would be interesting; I'd like to see the interior, haha. Was also thinking the Pokemon Centers could perhaps still have a booth that sells items, but it'd sell the specialty Poke Balls/Mails and TMs. (That being said, it seems more probable the PokeMarts will still sell those like always, but if they're fused with boutiques, then I can see the Pokemon Centers having booths as well.)