Thinking about how a pokemon game purely in one city could work.>1.Pokemon Colosseum Spiritual Successor
>2.Lumiose is big and intricate enough for wild Pokemon encounters to just fit into it.
>3.This has been a misunderstanding and Lumiose is more like Jubilife in LA and we're still going around Lumiose outskirts.
>4.The city won't be GTA level massive, still big, but not gigantic, and the main source of battles and conflict is in some sort of dungeon. Like if its in the past we get a cool dungeon crawler where some plot items and wild pokemon inside the (magical so it isn't just cave biomes) catacombs under Lumiose, and of course since we beat it in this game it doesn't appear in XY. Or if this is in the future maybe we'll do some shenanigans like portals to other worlds or Digital PC Realms and enter areas like the Indigo Disk place.
Out of all of these GTAmon(big city) and PersonaMon(dungeon crawler/life sim) would interest me the most.
Imagine it, go down into the magical and strange catacombs for battles and catching pokemon. Go up into Lumiose City for talking with characters, buying items, building up the city, and battles.