It is East of Mahogany town. Take a look at your map.
Its right behind blackthorn city
Yes.
blackthorn city
its in blackthorn city behind the gym
in the dark cave near blackthorn city
It is at he way to blackthorn city
Blackthorn city, (east of mahogany town).
you just go south of blackthorn city
To Blackthorn City.
Blackthorn City, next to the Pokemart
you have to beat team rocket in goldenrod city
Go to mahogany town then to route 44 into the ice to Blackthorn City. It worked for me.