i managed to beat Druddigon & Flygon, but Haxorus is just a little bit tougher
my team is:
sewaddle at lv 43 with tackle, cut, bug bite & razor leaf
swanna at lv 42 with water pulse, aerial ace, wing attack & fly
azumarill at lv 42 with bubblebeam, tackle, aqua tail & surf
joltik at lv 42 with electro web, bug bite, flash & slash
cubchoo at lv 47 with fury swipes, powder snow, strength & dig
& pink frillish at lv 31 with night shade, energy ball, psychic & brine