Go east of Mahogany Town and through the Ice Cave.
you have to beat team rocket in goldenrod city
Go to Blackthorn city and beat the last gym leader.
Get the first seven gym badges, the Elm will call you about a strange radio broadcast. You have to go to Goldenrod and beat Team Rocket. Now you can go to the gym
first go and beat team rocket in goldenrod city. once you do that head back to mahogany and head right. go through the ice cave to show up in blackthorn city
You have to beat team rocket in goldenrod city before you can go to blackthorn city.
you go to blackthorn city through the ice path
you need to beat the gym leader in mahogany Town then fly to goldenrod.
good job.you have access to blackthorn city now
To get to Blackthorn City, you must defeat (or catch) the red Gyarados and find Team Rocket's hideout in Mahogany Town. Then head east to Ice path. After that youre in Blackthorn City.
Blackthorn City Gym is available to challenge after you defeat Team Rocket in the Goldenrod City Radio Tower and make it through the Ice Path.
ekruteak city dance theatre after beating the team rocket grunt
first catch the red gyardos in the lake of rage by swimming up to it directly and then beat team rocket