In most Pokemon games you can get golbat in almost every cave
he or she will be about lv. 30 or over
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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 doesnt evolve by level, you have to trade it for it to turn 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.
To evolve Golbat into Crobat, you need happiness 87% I think.
Golbat can evolve in any level. Golbat evolves into Crobat via happiness. Your Golbat must be happy enough until it will evolve. It can evolve from having fun with battles. I suggest you give it a Soothe Bell to make this proggress much quicker.