Venemoth: What makes Venemoth different from Smeargle is that he can actually sweep on his own with Tinted Lens, or can use use Wonder Skin to potentially avoid status moves such as Spore and Taunt. I think C rank might be a bit generous, but Venemoth can more than set himself apart from Smeargle.I think it might be a good idea to clean up the lower ranks since there is some really questionable stuff down there. Here is a list of Pokemon I think should be dropped from the list entirely.
Venomoth: I don’t know why this thing is even ranked much less C rank. If you really want to quick pass Quiver Dance then Smeargle is better because it has a 100% accurate sleep move and it can run Taunt or Magic Coat in the fourth slot to stop phazing and other stuff. Its analysis was also rejected.
Celebi: Why use this over any of the higher ranked Grass types? Its defensive typing is terrible. If you want to do Nasty Plot + Baton Pass, you are probably better off using Mew which has more options for the other two moveslots and doesn’t have as many weaknesses.
Jirachi: Its analysis got rejected. It is versatile, but almost everything it can do can be done better by something else. Chansey, Sylveon, and even Umbreon are better at passing Wishes, Togekiss does ParaFlinch better, the Scarf set is very weak, and there are a ton of better SR setters out there. There are also a ton of Ground, Fire, Ghost, and Dark type moves out there to blast it.
Toxicroak: With rain now limited to 8 turns, Dry Skin just isn’t that good anymore. There is nothing about Toxicroak that makes it stand out as being good in OU.
Empoleon: Scald + Stealth Rock + Defog is unique, but is that really worth running something which is otherwise really bad? Its defensive typing isn’t that great outside of countering a few specific threats, and it has no reliable recovery. I think it belongs with Donphan, Forretress, and Tentacruel in the shitty utility Pokes category.
Also, I’m not sure if something having an analysis automatically means it must be ranked, because it is really difficult to make an argument for why someone should use things like Moltres, Snorlax, Meloetta, and Cofagrigus in OU.
Celebi: Having resistances to Water and Fighting-type moves is a great thing to have, even with the multiple weaknesses, and with Wish and Heal Bell support backed by great overall defenses and Speed, it certainly has a use as a cleric. Plus, if you incorrectly guess a defensive set, you might give it a free Nasty Plot boost.
Jirachi: Paraflinch is annoyingly cheap, but it can get the job done against slower threats. It has a niche, but I still hate its freaking guts.
Toxicroak: Due to Dry Skin, Toxicroak can check Azumarill and Choice locked Keldeo. It's barely a niche, but hey, it's something.
Empoleon: He can threaten Azumarill without Superpower, Greninja without Dark Pulse, Mega Mawile without Focus Punch, and Talonflame. He sucks, but has his uses.