You can find an Onix in the Rock Tunnel, in the Victory Road, and on Island 6 or in rout 10 be sure it's a boy because when its a girl it is weak
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geodude and onix
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 :)
Level up your Groudch
Onix can be found on seven island, six island and rock tunnel.
On mine it claims that Dugtrio evolves into onix whic is kinda weird