fly, if you haven't got it, go west of celadon city and cut the grass before snorlax, follow the road and a lady in a house gives you it, beat the celadon gym and you can fly.
or go back through the tunnel north of lavender town
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You may first want to go through Diglett's cave (there's a lot of good stuff on the other side of the tunnel), but eventually you'll have to go back to Cerulean City (Misty's Town) and cut down the tree on the eastern border of the town. You can then proceed east to rock tunnel, which leads to Lavender Town.
in almost every town (in your home town use your house) If you mean Pokemon center. Cherrygrove City, Violet City, Azalea Town, Goldenrod City, Ecruteak City, Cianwood City, Olivine City, Safari Zone, Mahogany Town, Blackthorn City, Indigo Plateau (Pokemon League), Mt. Silver (Silver Cave), Viridian City, Pewter City, Cerulean City, Vermillion City, Lavender Town, Celadon City, Fuschia City, Saffron City, Cinnabar Island, Kanto Route 10, Johto Route 32, Kanto Route 3.
The cities in Kanto are Saffron,Cerulean,Vermillion,Cinnabar Island,Pewter,Viridian,Fuchsia and Celadon.The last places are Pallet and Lavender Town.
Vermillion City is in Knato and Slateport is in Hoenn; you can't.
By walking there from Saffron City or through Rock Tunnel from Cerulean City.