Proposals
A --> A+
For a long time I argued that regular Aerodactyl was better, but I disagree with that now and think the Mega is very effective in this metagame. Bulky spreads are able to handle physical attackers while also maintaining a blistering Speed and high damage output with Tough Claws. This thing can tear up a lot of teams.
A+ --> A-
Agreeing that Skarm is just too passive. WW is great and Metal Burst can deal some damage, but that severely competes with its other slots when it still wants Roost, King's Shield, hazards/Defog, and even Taunt. Still a fantastic Diggersby check due to the prevalence of weaker elemental punches/Knock Off vs. Wild Charge, and with King's Shield it's one of the best answers to BD sets.
A- --> A
Also agreeing that Ferrothorn can do more than just support. The attacks you listed are all relevant to the meta. Its typing is awesome. All around great glue and synergizes great with other bulky supporters that are effective right now like Gyarados, Zapdos, and Latias.
No change
Not sold on this one yet. It is dangerous and often it does blow things up with Water Spout but its dual STABs are resisted by a lot of Pokemon, and like DarkeKnight said, it's easy to pick off without a Scarf or you can just shave off HP with priority and tank Origin Pulse much more comfortably once Water Spout is down in power. We all know its coverage sucks, and since it's almost always choiced, scouting is easier. Basically I think the metagame is getting accustomed to it and has prepared enough to the point where it doesn't steamroll teams anymore. But it's still really really good.
N/A --> C
I suppose as a bulky supporter it has its merits, thanks to Taunt and Hazards along with Recover. Psychic grants a lot of goodies, so there are some tools it gains that I'm sure we're not really utilizing to their fullest quite yet. However, Dark is easy to spam. Let's start with C rank.
A+ --> A/A-
I don't see this as much anymore because I think it's too outclassed by Diggersby. Support sets were popular for a while, but even there it struggled since it's vulnerable to Taunt and can't hit worth shit off 50/60 offenses. Overall, it's a good mon (Water is super awesome offensively) I just can't see it in A+ anymore.
A+ --> A/A-
Tyranitar has left the building. Seriously, where is it lately? Probably a combination of things: Landorus-T is everywhere, Keldeo is still everywhere, Scizor is still (nearly) everywhere, and there are other megas that are just better at fitting on teams, like Aerodactyl and Scizor. Mega Tyranitar
used to be my go-to mega. Now, I'm often struggling to find room for
any mega because so many threats are viable as standalones. Basically this has too much competition.
B+ --> A-
I have a huge boner for Gyarados right now, whether it be supportive (like my post in Creative & Underused) or bulky setup or Moxie. Its typing is great offensively and defensively and lately it hasn't let me down. Other people are recognizing it too. In the last room tour I joined, it was on both teams in the finals.
A- --> A
See above mostly because that's how this guy starts, only to get better. Intimidate+mega evolution is a slick little combo as we all know. Mold Breaker is just a great ability to have, too. I see Mega Gyara similar to Kyurem-B: Sub, Dance, Attack. Roost when needed. Crabhammer is the STAB of choice because Water is SE against a lot of common threats.
A- --> B+/B
I don't know what this is doing in A anymore. Shift Gear? All right, but its dual STAB blows and hits nothing SE in S rank for example. Is it still abusing Luster Purge? Not with Defiant as common as it is. I think this star is fading, fast.
B --> C+
This was common in the earlier days of XY. Besides always pooping on Keldeo, I don't know what else it wants to do. I guess it's a neat Quagsire counter and U-turn packs great momentum, but there are better team supporters in my opinion.
B --> A-
Hi I'm Clefable and I wall you. Basically this is just another answer to setup if you're looking for something other than Sableye/Quagsire/Diggersby. Namely, it isn't bopped by Fairy STAB like Sableye, it isn't 4x weak to a type like Quagsire, and it isn't offensive like Diggersby. Usually. It can setup on its own, something Quagsire never does, and Unaware is great for doing that.
B- --> B+
I really don't like #TheVoice namely because I *hate* facing it. It's fast, it Sings past subs, and it U-turns outta there just when you think you have it trapped. Sure, it's highly predictable and its STABs are shitty versus things like Heatran and Aegislash. But if the Heatran/Aegi player is foolish enough to let that Pokemon fall asleep, Pidgeot
will wear it down with Boomburst/Hurricane (or even Heatwave for Aegi, but I prefer Sing/U-turn/Boomburst/Hurricane.) Adam Levine wants this on his team, so that has to mean something.
B- --> B/B+
The combination of Moonblast/Power Gem/Earth Power is awesome on Geomancy sets. I think people often go for the Mega forme, but standard Diancie is still good, though the Speed even when doubled can be a let down. Luckily she resists Fakespeed, so revenging is a bit harder until Scizor comes in with Bullet Punch.
C+ --> Unranked?
C+ --> Unranked?
C --> Unranked?
D --> Unranked?
D --> Unranked?
D --> Unranked?
What do these things offer that aren't taken care of by something else?
Harder sells:
A- --> B+
All it really traps reliably is Skarmory, which is great for opening up a hole for Diggersby, but Skarmory is pretty threatened by other better Pokemon already, like Thundurus, Charizard, and Heatran. I guess it can trap Ferrothorn and remove it with HP Fire, but when I've run Magnezone, it has been with Volt Switch/Thunderbolt/Doom Desire/King's Shield. Why Electric twice? Because if you kill Skarmory with Volt Switch you give the opponent the upperhand with the switch, and we all know how valuable turns are in STABmons.
A- --> B+/B
So it's a bulky Scrappy spinner? Spinning isn't very hard and Defog is easy, too. OK, so it's a Scrappy Belly Drummer? Kangaskhan has better coverage and Drain Punch.
Let me know what you think!