Golbat will evolve if it has max friendship with its trainer which means it can evolve at any level.
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Goldbat evolves into crobat with friendship, just like togepi
golbat does not evolve at a certain level. You need to keep batteling and WINNING to evolve it. Mine evolved at lvl. 56
Make a Golbat level up on a high friendship level.
golbat can evolve at any level if its friendship is up to max power...or...it can evolve if you give it a berry that gets the Pokemon friendlier then get it one level higher and ... evolution
Golbat actually doesn't evolve at a set level. It evolves when it has maximum happiness (Happiness is achieved through walking around with the Pokemon, giving it massages, using items on it, levelling it up, etc.). Once it has maximum happiness, level it up another time. It should evolve.