after you have beaten the elite 4 in johto you will get an SS. Aqua ticket which will take you from olivine city to vermillion on Mondays and Fridays. When you're in vermillion you could beat the gm there and in saffron city you don't have to, so just head north until you each cerulean city.
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It is the Cerulean cape located north of Cerulean city on route 25 in Kanto
In Cerulean city. At the top left corner. P.s you need to use surf to get to it.
Not Heartgold right? But the old Pokemon Gold? The thief is in the gym in Cerulean City.
Bicycle Shop in Cerulean City ( EXPENSIVE )
It's slightly north of Cerulean city, heading towards route 12.