A man in the last building on the left in the far northern stretch of Castelia City will change the name for you.Hhe is the bald guy on the right.
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There is a name rater in Castelia city.
You can rename a pokemon by going to the Name rater
You'll find the name rater at Castelia City. It's the building north of Central Plaza on the left.
No, you can't rename traded Pokémon legitimately, you will have to use a cheating device for it such as an Action Replay. Here is the Action Replay code for it. 5215BE54 2800FB2B 0215BE58 B0022001 0215BE5C 1C388028 D0000000 00000000
Go to the namerater in Lavender Town or rename it right after you catch it.