If anything, this needs a grounded poison type. Toxic spikes can threaten this team greatly, and weezing can't stop it because he has levitate.
An option is to change softboiled on clefable for wish, and replace wish on chansey for aromatheropy/heal bell. That way, you're safe from toxic spikes.
Then again, Hitmontop helps with rapid spin if you want to replace something.
Or, you could just use the grounded poison like drapion, who provides toxic spikes itself. It's bulky and can stop many sweepers. But idk where to put it.
Anyways, congratualtions on the CRE!