if you mean the rock that becomes a staircase in explorers of the sky, its in the centre of the town, right of where you go exploring.
you use rock smash
an onix- rock dragon
23+H F199 J1J+ FR0S 5X20 &JPJ That code is for kings rock
in aegis cave in the rock chamber{ice will be first so you will fight regiice then regirock}
link cable, and a kings rock. that's it!
you have to use a wongermail code. look it up on google
The rock path is an optional five floor dungeon that is there so you can gather items, otherwise just go strait on to MT. Horn.
Cut,Rock Smash,and Strength hope i'd help :D :H
Use Rock Smash
the treasures increase chance of getting recruits (like the rock horn increases chance of recruiting rock types
Kill an unown that's shaped like an R
To get a Rock horn, beat Giratina at the world abyss pit. Also, it might join your team (if you accept it! ...and who would`nt?)