It is a Rock and Ground type Pokemon.
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Yes, and Onix is a dual-type Pokemon. Along with being a Rock-type Pokemon, it's also a Ground-type.
Ground type Pokemon like Sanshrew and Onix (Onix is half rock, half ground, like a Geodude)
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
If you mean,, what onix evolves into,, it's steelix,, but the is no Pokemon that evolves into 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 :)