it will evolve into crobat when its happiness is all the way up
friendship
Happiness maxed
if it likes ya enough it'll evolve
Golbat evolves into Crobat with happiness not a specific level, and why are you asking for the level in the Sapphire game while your question is in the Heartgold and Soulsilver category???
you evolve golbat by friendship
Golbat evolve into crobat with happiness
you need to have max frendship with golbat, but i think you need to trade to ruby/sapphire/emerald, then have it love you, then trade it back
Graveler-colen , kadabra-alacazam, gloom/vileplume, golbat/golbat. I don't know any others, butI believe there are more.
you need to get its happiness to full you do that by just having it in your party and battling and stuff the when its happiness is full level it up and should evolve
There are a few Pokemon you can find in victory road that will evolve those Pokemon are: Golbat, Whismur, Loudred, Aron, Lairon.
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.