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
friendship
it will evolve into crobat when its happiness is all the way up
Happiness maxed
if it likes ya enough it'll evolve
Golbat will not evolve in Yellow version.
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???
Make a Golbat level up on a high friendship level.
Golbat evolve into crobat with happiness
you evolve golbat by friendship
Girafarig will never evolve in sapphire or in any other Pokemon version.
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.