Go east of rustboro city.
East from Rustboro city you can find 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
Rusturf Tunnel is located east from Rustboro City you can also enter the cave from Verandturf Town.
It's in Hoenn region. You can play it on Pokemon Sapphire, Ruby, and Emerald
in the rusturf tunnel make a left at the end instead of right
In rusturf tunnel.
Go to the right of rustboro city, or the the left of Verdanturf Town. That is the cave you see.
There is no Pokemon in the Cave of Origin in Pokemon Emerald.
how 2 get in the under warter cave on Pokemon emerald
it is a cave
You can get a Groudon on Pokemon Emerald in Terra Cave.