Get a Pokemon that can learn flash and put them in your team , teach them flash and go through following the ladders like Mt Moon
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Now you can go through rock tunnel which is east of cerulean city.
Go to the rock tunnel in the east.
The route west of Viridian city. You can also get a mankey in rock tunnel
I don't think you can, so you're going to have to go through the Rock Tunnel. I know it's kinda hard, but it only took me around 5-10minutes. Go to http://www.gamefaqs.com/portable/gbadvance/file/918915/33196, it's a guide through the whole entire game! Hope this helps or google map of rock tunnel and it gives you step by step directions to get through
You'll need a Pokemon that knows cut, a Pokemon that knows flash, and a Pokemon that's good against the ground-type. Go through diglett cave to get to route 2, and look in one of the houses there. Get flash from one of the people and go to rock tunnel. use flash.I hope this answered your question. I really don't have the time to tell you how to get to the exit, but just think of it as a larger Mt. moon.