happiness.
I recommend giving it a soothe bell and taking it to the massage lady in veilstone city every day.
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Crobat does not evolve.
Goldbat evolves into crobat with friendship, just like togepi
To evolve Golbat into Crobat in Pokemon Platinum you need to raise it's happiness to max. To raise happiness simply keep it in your party fully healed for a while. You can also visit a girl in Veilstone City to give it a daily massage to boost it's happiness more. Once it's happiness is at max it should evolve on level up.
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 evolves into Crobat when leveled up with enough friendship.