All in all I think this is a very solid team, but there are a few things that can be improved. First of all sun teams with dugtrio on them are a huge problem to your team. This is why I would reccomend changing heatran to air balloon.
As for Rotom Wash i would use the same ev spread BUT make it a resto chesto set, thus maximizing the longevity of this machine. Also note that I would use t bolt instead of volt switch as without spec atk investment rotom needs all the power it can get, and rotom wash uninvested in speed is quite sluggish.
PS Name:Ultrabattler, ouultrabattler, ubersultrabattler
Peaks:#76 in OU(decent not great) on PS
#2 in Ubers(Damn it Poppy) on PS
Undefeated in RU so far! 20:0
Join weatherless OU to help create a better metagame!!!