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Unfortunately, you can't get an Onix in Pokemon Emerald. To have your own Onix, you need to trade it from FireRed or LeafGreen. Hope I helped :)
There is no such thing as a Crystal Onix in the Pokemon games series. It was only in the Pokemon anime.
You can find an Onix in Dark Cave or in Victory Road in the main game.
Onix isn't available in Emerald but could be traded from LeafGreen or FireRed, where it is very common in Victory Road, Rock Tunnel, and Sevault Canyon.
Onix can be found on seven island, six island and rock tunnel.