speak English im only 8!
The name changer guy is in eterna city next to the pokemart
In Jubilife City
Lavender Town.
lavendar town.
In lavender town
Slateport in front of the contest place
The only way is to get a big pokemon and go into places.
i think you can generate codes for that using pokesav.
the name rater is in goldenrod city to the left of the third gym (Whitney)
Lavender Town
ht28
01??FFD1