east from mahogany town and north from route 29
in the gym
Blackthorn City is located east of Mahogany Town. To get there, head east from Mahogany Town until you reach the Ice Path. Go through the Ice Path until you find an exist, which will be Blackthorn City.
blackthorn city.
There is no ship in Blackthorn City.
the blackthorn city is in the very north east city
In Blackthorn City.
The dragon's den in Blackthorn city
In the gym at the end of blackthorn city, of course.
Go to Blackthorn city. The gym is there
In Pokemon sousilver (I don't know about heart gold )you go to blackthorn city which is located in blackthorn city right across the blackthorn city's gym.
its on blackthorn city
Look in the grass south of Blackthorn City in the morning.