Well, I'm back for another few suggestions and ideas for changes in the thread. It seems like a lot could be added here, but it doesn't seem like many people care enough to be posting here, sadly. I'll start with a few 'mons that I've been using as of late.
I love Raikou in the current metagame and feel like it could use a higher rank. It's a great pivot for offensive teams, outspeeds most opponents and hits decently hard. It can pull off a lot of good sets. A very obvious set is the Regenerator set, but I've fallen in love with Primordial Sea. The ability to switch into Fire-type moves flawlessly is amazing and allows it to take advantage of Pokemon like Heatran and Victini, or at least play extensive mindgames. Additionally, it also allows it to use Thunder, which is a very powerful and haxy (30% chance to paralyze!) move, so that's pretty good and causes you to pretty much get the power of Sheer Force and such. You also get the ability to use Weather Ball this way. Although it requires you to run Rash, it can still be a really good move depending on your team (its a 150 BP water type move, which is stronger than say STAB Scald). About the abilities listed in the OP, I don't really see it using Poison Heal too well, seeing how it switches out a lot and would probably prefer Regenerator. Maybe Thick Fat could be added as well, since its nice to switch into Fire and Ice types as well.
The above is only talking about abilities, metagame wise, it is just really good at switching in and getting free damage and/or momentum. It can check things like Gale Wings, Manaphy, and most offensive Pokemon which can't outspeed it. while it switches in relatively easily on special attackers with an Assault Vest. It dislikes stallier teams, but it can still get momentum for your team and some chip damage with Volt Switch (I also used it as a back-up sweeper with NastyPass Togekiss, it can 2HKO Chansey at +4, which was great.), but the usefulness against offensive and balanced teams make it deserve at least B+ in my opinion, but I'd like to see it higher as well.
Omastar is surprisingly decent. I first started running it as a sort of joke test on a team which needed a Gale Wings and AteSpeed check (damn it, AteSpeedSpam is OP), which couldn't fit in Skarmory and it really does its job well. It has a great defense stat, but also a good special attack stat, which allows it to fit on balanced teams. I feel like the best and possibly only viable (besides strange lead sets?) ability is Levitate. Levitate does a good job at blocking a ton of Pokemon in combination with Omastar's unique typing in Water/Rock, allowing it to fire off Scalds. However, possibly one of the best things about it is that it has Spikes - an amazing move which it can spam freely when it gets a free turn. It also has Stealth Rock, but seeing how Omastar will probably get various free turns (things either easily beat it or get hard-walled, so you dont take much damage), it is better for the increased damage. I'd advice running Ice Beam and either Ancient Power or Earth Power in the remaining slots, to get some decent coverage.
*I do not run max defense myself, however I'm not sure what the better spread is, so I'll calc these with max def.
252+ Atk Choice Band Refrigerate Entei Extreme Speed vs. 252 HP / 252 Def Omastar: 58-68 (16.8 - 19.7%) -- guaranteed 6HKO
252+ Atk Choice Band Pixilate Entei Extreme Speed vs. 252 HP / 252 Def Omastar: 116-137 (33.7 - 39.8%) -- guaranteed 3HKO
252+ Atk Choice Band Entei Stone Edge vs. 252 HP / 252 Def Omastar: 112-132 (32.5 - 38.3%) -- 98.1% chance to 3HKO
Most common of these is Refrig, so usually it'll do way too good. Leftovers recovery will help too. It should be obvious that it can check things like Skarmory and Braviary easily. It may be beat by Dark Pulse Honchkrow but that's not too common.
I say it could be C or C-. It's fairly niche, but the niche it fills is important and it can pressure those Pokemon really well.
I explained what I think of Blaziken
here. Basically I'd like Unburden to be added as an ability. Maybe it could be pushed to B, but it is quite a complicated set (though really effective!) Same could be done for Lucario but its a bit less effective, although ESpeed helps.
Greninja has an okay lead set with Toxic Spikes / Spikes / Taunt and a STAB attack. It's not great, but it deserves to be listed. Add Sturdy to its abilities.
Normal Aerodactyl with Intimidate is a viable non-Skarmory Gale Wings check with decent utility. It can also lead viably (with Mold Breaker) but I haven't used that. It can switch in on the birds, take their attacks (isn't hit super-effectively by Fighting coverage!) and hit back with a usually super-effective Rock-type STAB move. Besides that, it can keep itself healthy with Roost, set Stealth Rock and Defog in a pinch. It also has Earthquake for coverage, and some weaker moves that aren't really too good. I run max defense on it, so it can take the hits it needs to take better, and max speed so it can still outspeed things, but there is probably a better EV spread that takes specific attacks and outspeeds specific mons, but also has other investment.
Note: Aerodactyl is really for offensive teams which need a check. Don't expect it to take the hits too well. It can counter the birds, but barely (maybe better if you have better spreads).
Infernape needs Mold Breaker or a variant added. It's a really good Pokemon with Mold Breaker Fire-type attacks, which is something not prepared for. Additionally, it gets a good secondary STAB and Encore. Encore can screw up slow set-up sweepers, but with Mold Breaker it goes through Magic Bounce! It may deserve a rise to B, but I'll comment on that later.
Little Ideas / Questions:
- Doesn't Aegislash have a viable Prankster set?
- Sheer Force DeoS is a thing.
- Pixilate needs to be added for Entei. More Viable than some of the other abilities and is really threatening. Also Serene Grace maybe for that nice 100% burn chance.
- Same thing with Genesect. Add Refrigerate and Pixilate.
- Skarmory can run Delta Stream viably.
- Zygarde needs Pixilate too.
- Dragonite needs Refrigerate.
- Why is Gliscor B+, I'd rather use Hippowdon 95% of the time or LandoT on offensive teams.
- Tinted Lens doesn't seem worth using on Greninja over Protean. Protean will allow you to hit them SE instead of neutrally, most of the time.
- imas234 says Adaptability should be added on Breloom.
- Why is Tentacruel in B+. It seems decent, but not that good.
- What does Meloetta do that deserves B?
- Blastoise-Mega doesn't deserve B. If you want to wallbreak with Drizzle, you have better 'mons that don't need to Mega-Evolve and thus can do it multiple times. Otherwise its outclassed by other Pokemon most of the time. It has a niche with its offensive coverage + Rapid Spin, but C maybe.
- Crobat looks terrible and outclassed. It could be decent for supporting, but not B-.
- If Zoroark is B-, then Absol should go somewhere around that too. It doesn't have that speed, but way higher Attack, and better coverage.
May test some more 'mons later, since some of these rankings seem strange. I will comment on C ranks and lower last time
Will post more later, when I have tested my new stall team more. May also comment on the viability of some other 'mons which I've used a lot which are higher.