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.
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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.
I'm pretty sure its Barboach. :]
the egg in Pokemon ruby is wynaut, the pre-evolved form of wobuffet
No, Gyarados does not have any evolved forms. It does however have the pre-evolution Magikarp. It would be interesting to see an evolved form of gyarados though...
No there are no Pokemon that can evolve into Rayquaza since it is a Legendary Pokemon and doesn't have a pre-evolved form.