Rank C is not a joke tier. It's just where the stuff that's not really good, but has a niche/can succeed, goes. Just saying.
Also, I just wanna say one last thing about SwagPlay Klefki: it's not getting a main set in the OU analysis. Also, it's for the exact same reason that SwagPlay Liepard was ignored by everyone in the NU suspect thread for it last gen as I'm arguing against Klefki getting moved up to A Rank because of the SwagPlay set; SwagPlay is not really that hard to handle, and is luck-based.
Klefki has nothing. Any electric type shuts it down, ground types shut it down if its a thunder wave variant.
Not to mention that Jirachi is an excellent Pokemon with tons of utility whilst paraflinching.
Again,
AOPSUser hit it right on the spot with his post: