I recommend Quagsire to give you nice bulky ground type, and if you are willing to work for it, raise a swalot until it has Toxic, breed toxic onto a shellos and from shellos to Wooper. I literally just destroyed Radomus with a quagsiire, noivern combo, However this is only possible after Shades gym
Also, perhaps a nice special attacker to balance your team out, seeing as you have 3 physical attackers and 1 sp attacker. Perhaps grab a budew and evolve it into roserade?