A Common Recurring Question in the community is whether or not Pokémon like Onix and Golbat will evolve. The Answer is Yes, but no.

When you follow the criterea for evolution, the Pokémon will try to evolve...

...but it stops. It cannot evolve

To Remedy this, you need to beat the Elite 4, once you have done that you will get a National Dex plus the Pokémon Network System on Mystery Island 1 works. This allows you to trade between Ruby, Sapphire and Colosseum to get Items and other Pokémon.

Without the National Dex...none of your Pkmn with GSC/RS evolutions will evolve

 
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