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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.
Right, You cannot get an pp max in Pokemon diamond or Pokemon pearl nor platinum!
It evovles with max happiness
Take it to the drug store