I want to nickname my Staraptor but I don't know where the name rater is. Help!!
The Name Rater is in Eterna City. He's in the large condo building directly to the right of the Pokemart, and he's the older NPC sitting at the table to your left.
Image source: https://guidestrats.com/pokemon-platinum-name-rater/
Hes in eterna city
In the building next to the Pokemart in Eterna City.