In slateport city there is a name rater who can rename your Pokemon remember Pokemon traded to you can't be renamed.
go to the name rater.
tip: you can't rename pokemon with nicknames already, you could if the pokemon doesn't have a name yet.
Only by evolving a previously unnamed Pokémon can you rename it.
The Name Rater will rename any of YOUR Pokemon. If you own a Pokemon that originally belonged to someone else (Like the Machop you trade for in Goldenrod), then he wont rename it.
No, you would have to make the code.
You can rename a pokemon by going to the Name rater
You should be able to rename a Pokemon any number of times in the game.
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.
In Eterna city where the second (grass type) gym is, go into the apartment block and on one of the floors there is an old man who will rename your Pokemon. He will not rename Pokemon that you got in a trade though.
no.
you can't
lavender town
Go to the namerater in Lavender Town or rename it right after you catch it.
In Eterna City, (the town with the second gym) beside the Pokemon shop, there is a building, go in and talk to the old looking man, then he will let you rename your Pokemon.
Just go to Exploration Record on the main menu and select Rename Team.