So I've put this trash on everyone's profile, might as well throw it up here as well. Aurora Veil + Dual Dance Tectonic Rage Haxorus.
http://pokepast.es/2fdee674af3d6240
+2 Tectonic Rage can usually OHKO Fini, guaranteed after rocks. If you want it to always be guaranteed, you can switch it to adamant, but then it gets outsped by scarf lele and lando and shit. So yeah, Haxorus' nature is up to each player I suppose.
http://pokepast.es/2fdee674af3d6240
+2 Tectonic Rage can usually OHKO Fini, guaranteed after rocks. If you want it to always be guaranteed, you can switch it to adamant, but then it gets outsped by scarf lele and lando and shit. So yeah, Haxorus' nature is up to each player I suppose.