Since Finch made a post home viability list, and because I'm sick of the tera circlejerk, here's some very rough viability ranking predictions. Some of these are pretty self explanatory, but I'll include notes when I feel they're necessary.
S
A+

(no defog, knock means kinda outclassed by tusk, still has intimidate, u-turn and ground immunity, so it's still really good)

(no longer hard walled by heatran, chooses its checks w/ tera)

(fantastic sneasler check, been using max defense, np, recover set recently and it's really good)
A

(insane damage output, but needs alot of team support, low speed can be exploited)

(really good fat defensive pivot, can set tr for ursa, provides future sight support)
A-

(best defogger, kinda passive tho)

(needs zama to go, will be alot better once that happens)

(see roaring moon)

(see roaring moon)

(walls zama)
B+

(losing defog hurts it, still good at punishing contact and pivoting w/ volt switch)

(has a hard time dealing with zama and urshifu)

(great at setting spikes, but super vulnerable to u-turn, fighting types)
B

(good utility mon, rock setting, defog, u-turn)

(stored power cheese, tera cheese)

(good coverage, but vulnerable to u-turn, many fighting types)
B-

(can punish intimidate and be a formidable sweeper w/ bulk up/agility)

(good heatran switch in)
C+

(great tusk better. so is lando)

(only good on trick room, which isn't a very good playstyle to begin with)

(niche zama, cinderace check)
C

(losing grassy glide sucks, but has a niche as a terrain setter)
C-