If by tat you mean Skyarrrow bridge in between castelia and nacreene, simply head straight down the road through pinwheel forest and when you come out there should be a gate to your right.
Castelia city just as you go into it after the bridge from Pinwheel Forest
castelia city
castelia City
The gamefreak building is in Castelia City. It is on the first road from where you enter from Skyarrow Bridge.
Since Eevee is a wild pokemon in Black and White 2 you can catch as many Eevee as you'd like. Eevee's can be found in the Castelia Park at the end of the Castelia Sewers.
from the janitor after you defeat him in a pokemon battle in the battle tower in castelia city in both pokemon black and white versions.
A man gives you the TM in an alley in Castelia City.
There is one in Castelia City and one in Icirrus City.
You trade 50 peolple and talk to a spy in Pokemon center castelia city
Flash is TM 70 and can be found in Castelia's Mode Street.
There is a name rater in Castelia city. In a building just go on the street diectly east of the Pokemon center
You go to the final dock in castelia city and take the boat. You have to take out team plasma on the island