Get the Nat. Dex. Then wait till Wednesday and go to Prof. Elm's town. Go to the very first Route you started out on. Then go to your radio and find Hoenn Sound. Hoenn Sound will only play on Wednesday. Then run around in said Route with the music playing. You will find Hoenn Pokemon. If it's not Plusle, turn the radio back on and repeat till you get it.
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you can not get regirock in soul silver but in platinum you can in a special event.
MT. Silver
Route 28 and Mt. Silver
Mt.Mortar
In soul silver and heart gold you find it in euritik city in one of the houses