A super effective fang move is weaker than a neutrally effective earthquake, so I think all 3 fang moves will be kind of useless. If you really want to use a fang move, then I guess ice fang would be the best because you can use it against 2 of Cynthia's Pokemon and use it to decorate cakes. If you don't, then this is the moveset that I would recommend.
Ability: hyper cutter
- sand attack -> earthquake
- harden -> cut -> X-scissor
- knock off -> faint attack -> poison jab -> swords dance
- quick attack -> aerial ace
You can get infinite TM26 earthquakes and TM40 aerial aces in the Battle Frontier, so I don't think you should worry about wasting them on a Gliscor. And because it doesn't really need any moves other than earthquake, you can use Gliscor as an HM slave.