So I've been playing around with a lot of Arceus-formes that are lower on the viability rankings recently and one caught my eye that I argue should move up:
Arceus-Ice: C+ -> B-
I've been trying out a 248 HP / 252+ Spe Calm Mind variant with either Thunder or Refresh in the fourth slot (Thunder is better in most situations, but I'll expand on that in a second). A couple cool niches I found for it:
- Despite having terrible defensive typing, Arceus-Ice has the 120/120/120 bulk to switch into a lot of neutral hits from common defoggers such as Latias, Latios, and most relevant support Arceus-formes bar Arceus-Rock letting it set up on them especially if it has Refresh. What this set does is either pressure those defoggers to switch out or lets Arceus-Ice become a huge threat in exchange for losing Stealth Rock so it forces a trade. It's a very specific role, but even a mono-attacker threatens a lot of the metagame with one or two Calm Minds. With Thunder > Refresh, there are less defoggers that Arceus-Ice can set up on safely, but it becomes a real pain to stop if it pulls it off.
- Without Stealth Rock on your side, you can revenge kill +1 Mega Salamence without having to worry about it having HP investment like you would with Arceus-Rock or any other Arceus-forme that only hits it for 2x the damage. It's not too impressive since you need Stealth Rock off of the field, but it's a better last-ditch effort than other offensive Arceus-formes at the very least.
- It has a scary offensive presence compared to other Calm Mind Arceus-formes because of its Ice STAB and Thunder as a coverage move.
- Despite not being able to easily set up a Calm Mind versus offensive teams, it is annoying to switch into if you can lure them into Mega Salamence which isn't really too hard to be honest.
Now these aren't the most sought after niches, I'm aware, but it is on par with the Pokemon in B-. Using an Arceus-forme has a similar opportunity cost to using a Mega Evolution and it seems to be that Arceus-Ice has about the same usefulness of the Mega Evolutions in B-. For example, Mega Scizor is an average Xerneas check with recovery and U-Turn, Mega Metagross is an average Xerneas check that isn't
complete bait for Primal Groudon, Mega Kangaskhan is annoying to offensive teams, and Mega Aerodactyl works well to keep hazards on the opponent's side and off your side. My point is that these Pokemon have a specific and rather one-dimensional role that they do
pretty well while coming with a sizable opportunity cost. Arceus-Ice seems the same way to me. It has one or two specific roles that it does pretty well and has the added bonus of being able to break through unprepared teams more than every Mega Evolution in B- could hope to (except maybe Mega Kangaskhan).
On the flip-side, Arceus-Ice has, in my opinion, a larger and more sought-after niche than the Arceus-formes in C+. Arceus-Grass doesn't check much anymore, doesn't pressure much anymore, and does a mediocre job of luring in things. Arceus-Electric has the worse end of the BoltBeam STABs, threatens less Pokemon, and allows Primal Groudon to come in even easier than Arceus-Ice lets it come in. Arceus-Poison checks Xerneas and, well, that's really it.
So yeah, I think that Arceus-Ice deserves to move up a notch. Having it in B- distinguishes it from the other less useful Arceus-formes in C+ and still shows how it is generally outclassed and difficult to fit on a team since the disparity between B- and the rank of the next best Arceus-formes (B+) is still pretty huge.