First things first, don't make two topics. You only need one.
Second, you need to go inside the mountain with Strength, Rock Climb, and Rock Smash. Go inside on the entrance near Eterna City, and it should be self-explanitory from there.
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To Everyone: I am now Ragnarock. I am currently awaiting my mod transfers. I will not anwser to tree afro unless I am using this account. DO NOT ADD RAGNAROCK TO YOUR PAL PADS IF YOU ALREADY HAVE TREE AFRO ADDED!!!
[b][i][color=navy]Pokemon Diamond____Name- Luke____Friend Code-0945-8747-6687
Battle Record- _51 WIN