Unfortunately there is no way to change the name of your human character once you have chosen it. To change the name of your Pokemon, the name rater should be in Goldenrod next to the Pokemart.
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start a new file and make sure you spell your name right.
You go to MENU & select it.
if you wanna change your name make a new pokemon crystal or go on settings
On every Pokemon game, there is a name changer. He will allow you to change your Pokemon's name, either with a small fee, or free of charge.
In Castelia City you can change your pokemons name. In the pokemon gym road of Castelia city there is a man in the lefthand building who will change your pokemons name. Just like in the previous games you can only change the names of captured pokemon. (Not traded pokemon, or pokemon labelled "N's Pokemon".)