First things first, you need to have completed Mahogany town A.K.A. team rocket and the gym leader and you need to get the rage candy bar from the guy on the very right of the town. Once you complete that, go to the Olivine Lighthouse and you need to complete it. you then need to get some medicine for a sick Pokemon when you reach the top. The medicine is from the other city. it is located in, Cianwood. You give it to the gym leader at the top of the lighthouse and battle her. if you win then You should get a call .
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You get it when they take over the radio tower in goldenrod city one of team rocket members gives it to you
They go in there with their Pokemon and make sure none of the workers do anything they don't want to do. Done!
go to goldenrod radio tower and go upstairs your rival will take it of. hope this helped:)
The large city I'm sorry I forgot the name of it but it has the radio tower, and team rocket try to take it over. Ya go there and the biggest building is a department store they should sell them
In case in goldenrod city take the underground path. There will be a door. Get the key from the rocket executive in radio tower. In case of lavender town we can't go underground.