There is no traditional "department store" like they have in Goldenrod City (Johto), Lilycove City (Hoenn), Celadon City (Kanto), and Veilstone City (Sinnoh).
However, in Unova, there is a place called Shopping Mall Nine... It's pretty much identical to a Department store except for the fact that it is not located in a city.
Shopping Mall Nine is located in the center of Route 9, the Route west of Opelucid City.
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It is located to the west of Opilucid and you can also battle a few people there so you can get money to spend at the department store.
In Pokemon Platinum, Diamond, and Pearl, the department store is is Veilstone city.
There is one on Route 9 and if you see any swirling dust in a cave you might get one from them. You can also get one in the department store outside Opelucide City.
The preorder bonus at Target for Pokemon Black and White 2 is a $5 gift card good towards anything in the store.
Yes, a waiter in the department store at the top floor has a lampent Lv.36 and he also has a minccino