The evolution of onix is steelix which you can get by trading it with a steel coat
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Onix doesn't evolve from anything. It evolves into Steelix, but Onix is the base pokemon for that evolution chain. :)
Onix does not have a pre-evolution form currently as of Pokemon Omega Ruby and Alpha Sapphire and has not been announced for the Pokemon Sun and Moon games.
No, the pokedex can be confusing sometimes with pokemon not in the same evolution chain showing up on the same page.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
Onix does not have a pre-evolution. It does, however, have an evolution - Steelix, which you can evolve it into by trading it while holding a Metal Coat.