Well, For zubat to evolve into Golbat it needs to be level 22, And For Golbat To evolve into Crobat it needs your full trust/Happiness.
Mine is about level 34 and Only has 139 out of 255 Happiness, So It could take awhile for it to be able to evolve.
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Golbat doesnt evolve by level, you have to trade it for it to turn into Crobat.
Golbat does not evolve at any specific level. You need to get the Golbat to like you a lot and then when it levels up it should evolve into Crobat.
Golbat evolves into Crobat when you have maxed out your friendship level with it. You can do that by keeping Golbat in your party and giving it the Soothe Bell. For more information relating to Friendship and ways to increase it, see the related link below.
It doesn't evolve at level you have to max its friendliness and it evolves into Crobat.
You have to get it up to 255! happiness.