I'm going to have a Durant with iron head, rock slide, and bite. It will hold the razor fang, so should I have x-scissor or breed thunder fang instead?
You'll definitely want X-Scissor to deal with things like Amoonguss, Mega Venusaur, and the Lati twins. Thunder Fang is pretty weak comparatively, and a neutral STAB X-Scissor will usually match it in power when used on Water-types.
Durant is one of my favourite bug Pokemon and I hate bug Pokemon. Everytime I want to use him I use this move set: Durant @ Life Orb Ability: Hustle EVs: 4 HP / 252 Atk / 252 Spe - Hone Claws - Iron Head - Crunch - Rock Slide/Stone Edge While Hone Claws counter the accuracy drop from hustle it also rises you Atk Iron Head is STAB and because Durant is a fast Pokemon you'll get to flinch your opponent Crunch counters the Ghost,Psychic types and has a high damage. You can go for either Stone Edge or Rock Slide to finish . If you want more acc. then I reccomend Rock Slide, if you think you can set another Hone Claws then go for Stone Edge.