I'll be blunt and say that Durant would hardly help your case, because of its pitful bulk, mediocre coverage and costant miss chance. Something that would be far more helpful for your team would probably be Klefki, which can easily switch on those threats and paralyze them. I'd also advise to switch your mega, since Gardevoir is quite redundant with Hoopa on the same team. Venusaur is probably the best one, because it also deals very well with the likes of Diancie and Lopunny. Finally, I would switch Gliscor to Rocky Helmet LandoT or Garchomp, since they handle Talonflame better, and complete the deal with a scarfer like Keldeo.