It I very easy to get however u need to have beaten all 16 gym leaders from the johto and the kanto region. If you have though, go to Mt. Mortar and go to the furthest cave entrance on the right stay right once in the cave and you should see a slope to climb with rock climb. And then once atop the slope move right Towards the cave entrance and keep moving on this path and then you will go outside and slide down a slope with rock climb and it will be right there surrounded by water and rocks. Hope you find it!
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Mt.Silver
let a porygon 2 hold a Dubious Disk, the same way you gave porygon 1 a upgrade to evolve it, and then trade it
you can not get regirock in soul silver but in platinum you can in a special event.
MT. Silver
Route 28 and Mt. Silver