Its in the building were you have to hold off waves of enemies. Then you take a elevator down.
The entrance is on the north west corner. It is the small building with a sign outside.
use the explorer kit
lavender and go west
Some of it comes from the Colorado River and some of it is ground water.
the under ground city that has not yet been discovered
Brock is at the entrance to Diglett Cave (the Pewter City entrance) on any day from one to three in the afternoon. He is not actually 'hiding', but just exploring the Diglett Cave.
You go to rout 8 and in the under ground path or go through SAFFRON city.
you can find them under ground or there is one in sunyshore city.
Dialga isn't acually in a city. It is in Mt. Cortet. Fist you have to beat team galactic leader and then free the three Pokemon they were holding. After that you go into the Mt. Cortet entrance near Hearthome city.
There is no fee to enter the city.
you get a gligar in the grass under the cycle rout but you can only get in the grass via the oreburgh entrance or the city where you get your fist gym badge
hes actually in the under ground place under goldenrod but you need to get imfomation from the imposter of the radio deriecter then go under ground and the real deriecter good luck