from undella town you follow the path upwards and move the strength boulder you can get to lacunosa town from here as well as giant chasm
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giant chasm
it is at the end of giant chasm
At the giant chasm
You get the TM Ice Beam in the Great Chasm.
You get ditto when you go to the Giant Chasm they are found at level 50 and up there that is also where you get Kyurem.