there are so many problems here,
first off the one legitimate threat you have covered well is excadrill, hippo / skarm take care of that fine, however,
Dragon weak, especially specially based, skarmory cannot take even two consecutive draco meteors, even with no SR, clefable is in the same boat.
Rain weak, slowking is the only hope to take rain boosted water attacks, and even then it is destroyed by thunders flying around, in fact starmie's stab hydro pump followed by thunder will OHKO it with your physically defensive spread.
Volc weak / sun weak your entire team is destroyed by standard sun sweepers / venusaur / sawsbuck and especially volcarona.
As everyone else has been saying NP Thunderus weak as well, esp. sub and lum variants.
You are also weak to opposing stall as you carry neither rapid spin or a ghost, and with hippo / slowking / golurk being susceptible to tspikes it's gonna be an uphill battle.
I think there are too many changes worth considering for this team to be even remotely similar to what it previously was.