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.
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You cannot change an OT name in Pokémon Platinum.
You go to the name rater. he'll say some stuff then ask if you want a better nickname say yes and change the name. you cant change the name of traded pokemon.
Unless you restart the game, it s impossible to change your name If you are talking about you pokemons name go to name raters house
Go to the house next to the Poke Mart in Eterna City. Talk to the old man and he will change your pokemon's nickname. Sadly, you cannot change the name of trade pokemon.
In eterna city he is a old man in an apartment building he claims he is a name rater select the Pokemon to rate the name then he asks you if you want to change it