Whare do I change nicknames in black and white 2?

Question

Where?

Answer 1

The Name Rater is in Castelia City. He's in the last building on the far street. It's the old man in the lobby.
Hope this helped!

Comments

:D.......

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1 Second after me Damn

Answer 2

At Nimbasa City, speak to the Pokemon Name Rater. He'll rate one of your Pokemon's name and ask if you want to change its name.