You don't. You must pass through it to progress throughout the game. The only other way you could get access to Lavender town is when you have the HM fly to travel there after you've already visited it but, that's later down the road.
Lavender Town
there isn't a radio tower in firered and leafgreen, but in gold, silver, crystal, heartgold and soulsilver its in lavender town. You need to go through rock tunnel to get to lavender town. You wil need flash to get through rock tunnel
The top of Lavender Town's tower
Go through the rocky tunnel
Get to Lavender Town through Rock Tunnel (or Fly there, but the HM is impossible to get until you have already visited Lavender Town.)
well first you need flash and you go to the rock tunnel and use flash and after you make it through the rock tunnel then you walk down the path and then you are in lavender town!
Lavender Town
there isn't a radio tower in firered and leafgreen, but in gold, silver, crystal, heartgold and soulsilver its in lavender town. You need to go through rock tunnel to get to lavender town. You wil need flash to get through rock tunnel
you go in rock tunnel then it will go in lavender <- this is not the right answer
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lavender town
lavender town check bulbapedia.com
in the Pokemon tower in lavender town
Lavender town can be found after travelling through the Rock Tunnel (which you need Flash). Geographically it is east of Saffron City and south of the Rock Tunnel.
in lavender town, you can ONLY get there by the rock tunnel
In Lavender Town.
The top of Lavender Town's tower