It won't evolve because you don't have the National Pokedex. Once you have the National Pokedex, which you get after beating the Elite 4, catching 60 different species of Pokemon, and completing the Sevii Islands sidequest, you'll be able to evolve your Golbat.
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No, it does not. The evoloution of Koffing stops at Weezing, when it evolves at Level 35.
No
something to do with photogates
The everstone stops evolving all Pokemon that evolve in the first place.
Well, if you are talking about it evolving I know the answer. If you don't want to evolve then press B on the Ds. But once it stops the next level it will evolve again. I hope my answer helped!!! The Pokemon will stop evolving if you give it a everstone.