>>58897546It's been a long time since gen 5, but is Accumula the first place where the camera tilts down to show off a DS landscape? That'd at least be a point in its favor for memorability, but I don't see how it has "actual map design" otherwise. Elevation changes are ultimately just fancy-looking fences and pokemon towns have those in spades.
I'd almost put it near Oldale. You go to it, see the plasma intro cutscene, and never return again. Oldale is at least usable as the post-Norman path to let you surf back to Slateport/Mauville if you don't want to go the long way around for whatever reason.