Quick double post nom, just to do this officially and not behind the scenes:
Mega Lucario, Jellicent, Linoone, Conkeldurr, and Blastoise Tier 3 -> Tier 4
These all fit Tier 4 much better and were only in 3 because it was the lowest possible tier
Weighing in, I disagree with moving Mega Lucario down personally. Even though it dies to everything, it still hits like a truck. Bulky Thundy, Musharna, Mew, Victini, and Gyarados are the only Pokemon in tier 1 - 2 that live a 2hko from it's stab moves (Iron Tail > Flash Cannon right now) and the more common Iapapa Mew sets are cutting it very close.
The others I absolutely agree with dropping.
UR --> at least 3
Basically the Mega Kang of this meta until Mega Lopunny is usable. With Pure Power ability, it is an extremely powerful mon. Also, as nice coverage (Ice Punch, Rock Slide, etc.) to include with its fantastic STAB (The meta includes many Dark and Fighting types). It's role as a Fake Out supporter or a Quick Guard user is nice as well in this meta.
Can I get a replay of this in action? I'm having trouble wrapping my head around this doing well in practice, because it seems like it drops to almost everything popular/good right now while also being slower, but I acknowledge that it hits like a truck.
I'd like to Nominate
Thundurus-Therian to Tier
4. It's just badly outclassed by Incarnate for the most part, outside of it's scarf set which, in all honestly, doesn't feel like that good of set right now. Even with sets that don't utilize Prankster, being faster than Keldeo / Latios is incredibly useful for regular Thundurus while 20 special attack is less so. Regular Thundurus being so good also means almost every team will have prepared for this while teambuilding.
Some other Tier 4 nominations.
Deoxys-N. It hits really really hard but it's honestly hard to fit on teams. It's super versatile but will probably end up running the same small handful of moves in every situation. That being said, it ties at being the fastest viable thing without a choice scarf, has a 140 base power stab, and 150 special attack, meaning it will almost always dent something.
Tsareena. Queenly Majesty + Feint are actually incredibly, incredibly useful for any team featuring some kind of glass cannon. U-Turn/Trop Kick/Play Rough/High Jump Kick/Low Sweep all do just enough that every single one of Tsareena's moveslots feels like it's contributing. That being said, it's stats are mediocre and it's typing is barely okay and I don't see it going above tier 4 for the time being.
Zygarde-10. It's kind of a mixed bag, but it has a fantastic spread move in Thousand Arrows and limited switch ins because of it. It's movepool sort of sucks, but Extreme Speed can be useful. It has pretty okay synergy with some redirectors as well which helps it a lot.
Meloetta. I think this has proven itself on Han's TR team, it's a very useful offensive trick room setter thanks to it's excellent bulk + immunity to ghost + stab spread move. Certainly niche, but I think it so perfectly fills what would otherwise be a hole in nearly every trick room build imaginable that it's worth ranking.