its on route 116. use rocksmash. u have to reunite the karate guy with his girlfriend and he'll give u strengh.
East of Rustboro City.
There's no Ventredurf tunnel - Right name is Rusturf tunnel, which links Rustboro and Verdanturf.
East from Rustboro city you can find Rusturf Tunnel.
in the rusturf tunnel make a left at the end instead of right
In rusturf tunnel.
the secret entrance to rusturf tunnel it is up on the mountain
the hm move strength is found in the cave Rusturf tunnel
in rusturf city
use rock smash on the rocks in rusturf tunnel and a guy will give it to u
Skitty does not appear in Rusturf Tunnel. Only Whismur are there.
catch a skitty at the gras between rustbory city and the rusturf tunnel if you got it let it evolve using a moonj stone
Using Rock Smash move, break the rocks inside Rusturf Tunnel and the guy there will give you HM Strength.