ubers tend to have common weaknesses. EG. Rayquaza, Groudon, Kyogre, Mewtwo, Ho-oh, Lugia, Deoxys, Jirachi
Rayquaza, kyogre, groudon, lugia, ho-oh, can all be KOed in two or less turns with starmie.
mewtwo, jirachi and deoxys will be tougher, but I have OHKOed Mewtwo before with Heracross, jirachi can be KOed with a Metagross in two turns with EQ, Deoxys is quite hard if it has Choice band and is FR deoxys, but other than that, deoxys is OHKOed by Heracross.
So good pokemon would be starmie, heracross, some 600 base, and maybe ninjask. I still don't really know how to use ninjask though. That sub of yours ~bent~ will be wacked straight up, Unless you have something like bright powder attached but that relies on luck