Okay so I didn't play games on alt because I forgot, also I'm here to test not win discount OLT
Slowbro
Honestly, I underestimated Slowbro's physical bulk. While we all know what it does and what Slowking did (basically the same thing), the physical bulk makes it so much more helpful imo. Being able to actually check Mamoswine/Terrakion/Keld(not all 3 at the same time) all in one slot is really useful instead of resorting to Palo/Lurk + Washtom/Weez cores that you would generally see. I think
Thunder Wave is one of the best options for Slowbro in the third slot, even more then future sight, as when paired with offensive mons, having their speed control para'd can greatly increase the pressure your offensive breaker/wincon opposes on them. Most typical switch-ins into Slowbro seem to be Noivern, Zarude, Celebi, AV Reuniclus, and even opposing Slowbro/Slowking. Slack Off can be used if you don't really need to punish these switch-ins, or can otherwise pressure them, e.i. Mamo's Ice Shard or a revenge killer that MU's well vs the offensive threat. Toxic is another option to punish the more defensive switch-ins, such as Reuni and Slowtwins, but I honestly think Thunder Wave is the superior option.
However, this mon isn't perfect. Slowbro is pretty easy to lure, as water psychic is a good and bad defensive type in the meta. Checking fighting types and water types is great, however, most of these have some form of Dark/Bug/Electric/Grass attack to threaten Bro with. A good example of this is SD Megahorn Cobalion, which has become increasingly common on the ladder, as Slowbro can't take 2 at +2 and even when Cobalion is at neutral, Megahorn is doing more then Regen can recover. Another issue I've ran into is the lack of special bulk. The cool thing about Slowking is that it could function as a backup check to stuff like Noivern due to it's massive special bulk. Slowbro doesn't quite have that bulk, so hits that Slowking could shrug off, Slowbro loses out.
(click me)
Here's one of the teams I'm comfortable with sharing. It's not anything Estarossa or Amane Misa level, but it's not the worst build out there. Basically, it's Bro+Gigalith, which covers a bunch of threats, + like a million Grass checks. Mamo got a lot better this shift imo, so i've been pretty big on it recently.
tl;dr - Slowbro is a great addition to the UU tier. Status options tend to be good in the 3rd slot, and Slack Off/Future Sight can be okay options for more offensively focused builds. While it does have its flaws, it's upsides definitively outweigh it's downsides.
8/10
Zarude
The second newest addition to the UU tier, Zarude has absolutely blown past people's expectations as a okay mon, and has shown itself to be a top threat. It's speed tier is pretty good, typing the other base 105's, such as Scyther and Mienshao. It has a versatile set of options it can run, such as a Pivot set, Choice Band, Bulk Up and Choice Scarf. It's bulk is also somewhat surprising, as it can live hits you wouldn't expect, such as always living Cobalion's CC from full health. The set I mostly used was Bulk Up, so I'll primarily be talking about that.
As you probably know, Jungle Healing is Zarude's signature move and it's pretty good. However, healing only 25% can be quite a hindrance in some situations. This is one of the things me and
DraconicLepus have discussed on a couple occasions, not actually about RW though, and what I've also found in testing for RW. Synthesis seems to be better on Pivot sets with Heavy-Duty Boots. Bulk Up appreciates Jungle Healing a bunch, so when paired with Leftovers, almost makes up for missing half a recovery. Bulk Up is very potent in my opinion, as you can set up on weaker physical attackers and pokemon such as Mudsdale or Bronzong that would have Body Press to attempt to threaten you. +1 Power Whip hits quite hard, and Darkest Lariat is nice for beating Iron Defense + Body Press pokemon that would set-up alongside Zarude (I ran into like 4 of these).
My issue with Zarude is that it's so easy to see coming, and is punished very severely by U-turn. While in theory, it should be a Scald switch-in, It really doesn't want to be burned, so Jungle Healing sets are the only true answers to Scald. It's also slow enough to be pray to the muskateers, as well as the ever popular Noivern, and risking a tie with Mienshao can force very not fun 50/50s for you. Again, Jungle Healing is kinda bad for recovery alone, so you're kinda forced into either synth with no status removal or status removal with crappy longevity. However, again the pros seemingly outweigh the cons.
tl;dr - Zarude is okay, Bulk Up is pretty good in the current metagame, but due to it's moderate speed tier, falls pray to stuff like Lycanroc-D, Noivern, and Talonflame. Overall, Zarude is a very versatile pokemon in my opinion, so it's a
7.5/10 for me.