go to the middle of the cave you find. you'll be outside. go to the middle where you find a pool. a legendary pokemon call kyurem will make a blizzard. after that, you can't leave until you catch him. he's lvl75, and the hardest pokemon in the game to catch. i highly suggest you use a lvl75 reshiram or zekrom, though.
giant chasm
it is at the end of giant chasm
At the giant chasm
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
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.
Kyrum
In the giant chasm
You go to giant chasm
in giant chasm
Giant chasm
Giant Chasm
giant chasm
it is at the end of giant chasm
After you beat the elite four you can catch it in the giant chasm there is also a legendary Pokemon in the giant chasm called kyurem.
in the giant chasm
In the Giant Chasm when you get up to that part
At the giant chasm