Hiya, I have some thoughts about the viability ranking. From what I've seen it doesn't reflect the current meta very well, on certain pokemon at least. Please weigh in on what you disagree/agree with.
A+ -> A
Though swellow is a great threat, it's quite prediction heavy and doesn't fare too well against the other S/A tier threats. It doesn't see nearly as much usage as Steelix and don't think it's as good. It's also frail compared to the other top tier threats, meaning it can't get a prediction wrong or it dies. Plus the scarf item is revered.
A -> B+
Alakazam is a very fast mon but can't run scarf. It doesn't even get a boost compared to regular OU. Don't think it's all that good, def not A level.
A -> B+
Cotton guard is a good move but it can't get it off all that often. It's still very weak to getting revenge killed by special attackers (koko, swellow) after setting up.
A -> B+
Worse than it appears. It's still quite frail on the physical side and gets OHKO'd by most high tiered mons while not being able to outspeed. Its special bulk and strength is impressive but still has an abysmal defensive typing.
A- -> B+
Think steelix has a definite edge over aggron as a better SR setter and it has an actual powerful ground stab. Plus it doesn't cost a mega slot.
A- -> A
Is always on decent ladder teams. Has a great movepool and is one of the only answers to koko.
A- -> A
Similarly to chansey, it isn't actually weak to common attacks and is still really strong. Ghost+fighting is unresisted so all the coverage you need. No real counters (other than fast sab maybe).
A- -> B
What is this used for again? Havent seen it do very much, its dracos don't do that much.
A- -> B
Has better answers to it than for example swellow, koko or gren. Quite predictable, dont think it's A rank material.
B+ -> A
Good tailwind setter and sash lead. Does a lot for the team archetype which is currently quite strong.
B+ -> B-
Why
B+ -> A-
Ash gren is very scary and with more sturdy/sash mons it's easy to pick one off and get ash gren. Water shuriken is very welcome too.
B+ -> C
Haven't seen this being used much at all, still has a bad defensive typing and doesn't get that good a boost. Movepool is lackluster.
B+ -> B-
Elec "use koko" trode has good speed but there's better options.
B+ -> A-
Its STABs come off a better 170 now, plus it has great coverage for the top tiers. Can take a hit as well.
B+ -> A/A-
Great sweeping potential. Haven't used it but quite strong vs common teams.
B -> A-
One of the only fast set-up mons that can take hits too. Very scary to face.
B- -> A/A-
Made a post about this already. It has a great match-up vs most top-tier threats and can reliably set up rocks.
B- -> B+
Without rocks up works very well. Has tailwind too.
B- -> A/A-
Don't get why this is so low. Prankster tailwind and priority attacks under terrain coming off 116 base, yes please.
C -> B
8 turns of veil is a lot in this tier since most battles are over quickly. Shame about ttar, but you can run hail.
Think Slowbro, Kartana, Electrode, Florges can drop as well a bit maybe.