Here's a new convergent of Sinistea, Sinink. The rendering style is different because ZA has more anime art style in comparison to SV.

Game doesn't take entirely in the city. You actually get to go outside of the city, but it's just dungeons where you catch Pokemon not normally obtainable in the city. The city is the open world portion of the game.

The game takes place before the current Lumiose City is built. It has five rivers that cross the city. You must defeat each five district leaders to progress through the city.

That's all.