Nihilego -> D/C-
ok basically, this does much more than one would expect. the spread I came up with e.g. lives a Life Orb Ho_oh Brave Bird after Rocks, is mathematically favored against every GeoXern variant (I think +2 into +0 Focus blast is a roll/ Thunder shouldnt kill in 2 cause its weaker, and glhf hitting 2 in a row in the first place, and I guess HP ground is a thing but lol.). It can also check Life Orb Ray lacking EQ and the only thing it worries about from Yveltal is LO Sucker/ Specs Dark Pulse (which isnt even a 2 hit from full if I'm not mistaken). I have already wasted way too much time laddering with this and unfortunately the only replay I actively thought of saving was vs some 2000 dude using lance stall, which I did win w my team oo. I'll be collecting more as I go along, but I wanna encourage some experimenting.
Next issue that appears is that it gives every steel a free ass turn, which means you have to pair it with Ho-Oh or Celesteela or such, or run Foul Play as the 4th move for Dusk Mane, which I havent tested yet personally.
I'll edit in more eventually
(also support the Ultra Necro and Mega Slowbro noms, not decided on the Steel/PoisonCeus ones but definetly leaning towards supporting rising SteelCeus)