you go to the name rater's house. but if it is a trade Pokemon then you cant rename it.
Go to the name rater(works in every version). He's located in Slateport city above the Pokemon fan club
You Can Go By The Pokemon Name Rater
The name rater is in the building on the left in the northern part of Castelia City.
Northcoast town
depends name rater or move deleter
you go to the name rater's house. but if it is a trade Pokemon then you cant rename it.
In Slateport. Beneath the Battle tent and above the Pokemon Fan Club.
Go to the name rater(works in every version). He's located in Slateport city above the Pokemon fan club
There isn't one. It doesn't work like that. If the pokemon is originally caught by the trainer asking the Name Rater, he will say it could be better and offer to change it, no matter what the pokemon. However, if the Pokemon is traded or migrated from a different game, the Name Rater will say it is perfect and refuse to change it. He will also refuse to change Shadow pokemon in Orre, if they havnt been purified.
Northcoast town
The name rater can be found in lavendar town.
You Can Go By The Pokemon Name Rater
Find the name rater.
The name rater is in the building on the left in the northern part of Castelia City.
Goldenrod City. Near the northern gate on the left there is a purple tent with the Name Rater inside. He can re-name your pokemon.
You can rename pokemon when you first obtain them or ask the Name Rater to change it. The Name Rater is in Lavendar Town he's in a house below the Pokemon Center. Bring the pokemon you want to rename to the Name Rater then he will let you rename it. Keep in mind pokemon obtained through trade cannot be renamed.