Actually gligar can be evolved anytime by using a razor fang on it. It has to be during the night I can't remember the exact time. After 7pm and before 6am should be ok.
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gligar will evolve when you gave a razor fang at night
train gligar at night with razor fang then he will evolve into gliscor!
Level up a Gligar at night holding the Razor Claw.
Gligar will only evolve at night-time(best time:12.00midnight)but,it will have to hold the item razor fang,just like weavile,sneasel has to hold the razor claw and level up at night so do the same with gligar,but give it a razor fang(can be found at the fight area in the battle tower)then it will evolve into GLISCOR which can learn thunda,fire 'n' ice fang!>!>!>!>!>!>!>!>!>!>!>!>!
Give Gligar a Razor Claw and level it up at night.