I made sure my Gligar was holding a razor fang and I leveled it up three times after 8:00pm but it still wont evolve! Is there a special time of level that it will cause it to evolve?
Are you sure:
The time may not be set to night time. Try setting it to night time in the ds settings.
Also, Gligar may be holding the razor claw instead of the razor fang.
I hope this was helpful!