After beating the elite four go to the fight area and go through the gate to get to the battle tower. When you pass that gate go left and there will be a poke-ball. Get it and it will be a razor fang. Give it to gligar and level him up between 8 pm and 4 am.
You must find a razor fang thier is one after the e4 in the fighting area .
Give it a razor fang
First get razor fang and lev up at night
With a razor fang
You need to give gligar a razor fang and level it up at night
Give gligar razor fang then level him up at night 2 get gliscor
Give it the dragon fang and then level it up