To evolve golbat to crobat your golbat must like you, there is a thing called Pokemon kindness each Pokemon grows to like you when they get stronger and etc, anyways all you have to do is use protein, iron, carbos, calcium, zinc and hp up on your golbat and train it a few levels and it will become a crobat.
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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.
how to evolve golbat in platinum.. how to evolve Scyther in platinum. how to evolve electabuzz in platinum. how to evolve magmar in platinum.
Golbat will evolve if it has max friendship with its trainer which means it can evolve at any level.
Golbat doesn't evolve in pokemon red, blue or yellow. Generation II, and onward, if Golbat's happiness is high enough it will evolve into Crobat.
You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.