Golbat does not evolve into Crobat at a specific level, it instead evolves by love. If you want it to evole, battle with it a lot and don't let it die, it will come to love you and eventually evolve.
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Golbat will evolve if it has max friendship with its trainer which means it can evolve at any level.
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
You need to level Zubat up to level 22. Then it will evolve into Golbat.
Nothing. You need to make Golbat to have Friendship or Happiness.