Hello, how are you? I'm writing this because I saw your RMT and I couldn't really come up with something I really liked (I haven't been in my best mood to build lately either so it's not necessarily the team or anything) but I wanted to share some insights with you regarding the team so I thought it'd make more sense to just PM you rather than posting there. I'm gonna add some attempts I built last week as well as some potential changes but in the end the main thing I wanna share are my insights.

I'm not really gonna focus on the positives of the team because that wouldn't really be the point of this, but don't think it's a terrible team or whatever as it's for sure not but I'm gonna focus on the flaws to try to share my thoughts and potentially this could be an interesting read to you.

First thing I think your team could be improved on is synergy overall and that would start with what the team was built upon: Electrium Z Rocks Nihilego. First off I don't really like this set as now Gligar is so popular it kinda lacks the purpose of being a great rocker as it used to be and it also steals the Z move from your breakers which are the primary Pokémon that would like the SR support an offensive rocker like Nihilego potentially provides. I know you've justified Gknot over HP Ice to lure bulky Grounds, which is fine, but that kinda already runs away from Nihi's main purpose as a rocker: keeping them up and beating hazard removal overall.

The option to pair it with such a bulky Scizor set was odd to me. It lures Tenta and Empoleon as you said, but I don't think that's the most optimal way to use Nihilego to the fullest of potential as a rocker. I'd prefer having a core that tends closer to HO or something.

Okay, as for the rest of the team: I think you took too bulky of a route for Nihi to be really appreciated. Your team doesn't seem to really enjoy rocks up as a more offensive build would. I understand the reasoning and I think it's natural to try to patch the weakness first, but I believe a more offensive approach would help it much more. It seems like if Nihi gets rocks up and the opposing team also does so you're gonna be feel pressured to Defog with Rotom as your team is rather bulky.

Also, it's a bulky team that really feels pressured by Scizor. I think you kinda lose to Quick Attack Scizor and just by an opposing Scizor existing you get very pressured to Defog. If it's banded, it's very easy to chip the single pivot the team has for it. One of my potential suggestions is just running Jellicent>Slowbro out of making the Scizor mu better. It makes the stall mu worse for sure but I don't really see many ways to improve the Scizor mu (I only see another one that i'm gonna mention later).  If it weren't for Scizor I'd for sure suggest Reuniclus, but Scizor is a thing sadly.

I think there were other things I wanted to say but I forgot lol. I think the main thing that I think could be improved is the approach you took with Nihi and how on my attempts the main thing I wanted all the time was to try to just take Nihi off for something else and then it would feel much better. I think maybe a breaker over Scizor could be cool but I don't really know.

The other way I had to circumvent the Scizor problem and exponentially help Nihi was trying dragmag. It kinda worked out but it runs away from what the team originally is. I think it explores Nihi way better though. Let me know if you want to take a look on it, although it's not very good.

I think the final thing is just addressing that if you go with Viv's version be very very careful with Scizor and mainly with Suicune as you now can lose to it (unless you make bro CM or something).

I believe this finishes it, hope this can help you somehow. Best wishes to you