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.
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after you get to vermillion city go past digletts cave and go into the grass and look down there should be a opening and go in there and carry on suicune is at the end of the path
You go to Saffron City and go to the south.
Vermillion City is in Knato and Slateport is in Hoenn; you can't.
After beating cerulean cities gym head down from cerulean and enter the underground path go through then go down and there is vermillion.
there is more than one, one in vermillion city to the left of the Pokemon center, one in fuschia city to the right of the Pokemon center and to the right of the wardens home, one in the vermillion port area which is to the right of vermillion you go to the right of vermillion then go down until you find a house with a blue roof in there is the last guru.