diglett evolves into dugtrio, onix is its on Pokemon that evolves into steelix using metal coat.
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No, the pokedex can be confusing sometimes with pokemon not in the same evolution chain showing up on the same page.
Onix doesn't evolve from anything. It evolves into Steelix, but Onix is the base pokemon for that evolution chain. :)
To evolve onix you must give it a metal coat then trade it and it will evolve
In order to evolve Onix in Pokemon Crater you must beat Cynthia. After beating Cynthia she will give you the mental coat to evolve Onix.
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.