After getting HM1 CUT go east of cerulean city and cut down the tree, continue east and eventually find a cave that is rock tunnel.
rock tunnel
Go east from cerulean city keep going until you reach water go south and into the cave this is Rock 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.)
Go through the rocky tunnel
The Rock Tunnel leads you directly towards the Power Plant. Just continue through the tunnel. You will see it upon leaving.
rock tunnel
Rock Tunnel is located due east of Cerulean City, around the corner from the pokecenter.
You take rock tunnel..........
Rock Slide is taught by a move tutor in Rock Tunnel.
On the way to rock tunnel,near cerullean city
Go east from cerulean city keep going until you reach water go south and into the cave this is Rock Tunnel.
in power plant, near entrance to rock tunnel, have to surf to it
use the move Flash (TM70)
head west of cerulean city to the Rock Tunnel
i caught mine on the path from Cerulean city to Rock Tunnel
you can find zapdos in the power plant just below the rock tunnel
It is east of cerulean city, HM1 CUT is needed and HM5 Flash.