you have to go to the old ghost tower, east of vermillion city, it is now a radio tower and they will give you a Kanto radio chip for your pokegear.
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You go to lavender town for Kanto and Goldenrod for Johto
If you mean the guard by the elavator, you can't get passed him.
fix the problems in the kanto region get the power plant working and then go to lavender town radio station.
fix the power plant
Its in Pallet Town in Kanto