An easy way is just to go to Cerulean go to the Pokemon center and go down and then youll find and opening follow it battle people and then youll find a cave going down DONT GO IN!BECAUSE YOULL BE IN ROCK TUNNUL!and that's a route on how to get a shortcut of the rock tunnul.
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safari zone and rock tunnel.
use the move Flash (TM70)
Get Flash from a guy a route 2 Get Flash from a guy on route 2
you get it AFTER you beat blue
There is it is in ilex forest