the place is called Ruins of Alph. you can find it by going south from route 36 GOOD LUCK!!!
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You can not obtain a Crystal Onix in the Pokemon games. It is only featured in the TV show Pokemon
I have no crystal. I think in crystal cave? Dont work? Watch on joutube.by by from belgium.
They can be found in the dark cave but they are rare.
It is on the waters in Union Cave on Fridays.
you can find it in waterfall cave in kanto