Bill's relatives live in Goldenrod City, and if I recall correctly they live on eastern side on the path to the bike shop.
above cerulean city! were bills old house is.
bills house is north of cerulean
Aliza town
Blackthorne city is not in Pokemon Diamond but in Pokemon Heart Gold/Soul Silver
you show him oddish (get it by the pokewalker)
it should be in olivine city
blackthorn city
In fuchsia city.
by being awesome
dodo
The Pokemon Daycare is on the route South of Goldenrod City.
The Pokemon Fan Club is in Vermillion City.