Feed it medicine (Iron, Calcium, etc..), make it win battles, give it a massage in Vielstone city.
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level up your GOLBAT with high happiness.
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.
He evolves at any level with MAX happiness(you can check your poketech app, the one with hearts over your pokemon. 2 hearts=max happiness.). But, you must level him up with max happiness during the DAYTIME.
You have to level it up with high happiness during the day(10:00 AM to 5:59 PM).
umbreon: lvl eevee 1 lvl up with happiness at late night (not rare candy doesnt work) espeon: lvl eevee 1 lvl up with happiness at day (not morning)