Slowpoke for A+
Drilbur for A+
Slowpoke is the premier physical tank in the metagame (not hippo who is support because of SR and sand, and is a wall more than a tank) at the moment, and actually is much better than people give it credit for. Its mixed sets are ridiculously hard to break through, posing incredible bulk off of 568 HP and each of its defenses around 300. Its physical sets have absolutely astronomical bulk, rivaling virtually any attacker in the entire metagame (banded cranidos head smash does 70%). It also has a very usable attack stat of 130, and it can dish out damage very well, as well as fish for scald burns when its not using that attack stat. Slowpoke can wall tons of attackers in the metagame, physical and special alike. Adrian introduced an AV set back in august that was really, really good, as well as being a great lure for special attackers. Regenerator makes it easy to pivot out and in, making it very hard to take down even without slack off. Slowpoke really can do almost anything it wants defensively in this meta.
Drilbur is ridiculous. Sure, it needs one other mon for it to live up to its true power (hippo), but that power is so outrageous that I can almost say it belongs on every single team in 350 cup. Life Orb Sand Force Earthquakes absolutely decimate most of the metagame, and with a simple swords dance boost it can really work wonders. With Swords Dance, Drilbur's earthquake can ohko physically defensive slowpoke. Slowpoke. A mon with 180/130 bulk is ohko'd by this nonsense. Good coverage and great utility in rapid spin make it absolutely ridiculous. The only thing holding it back is slightly more speed, but then again this thing can also run sand rush if you want to outspeed things. If you forgo the power/speed of sand, you still get a very powerful mon with nice utility for a team.
Carvanha probably belongs in A. Its just so powerful and has a anti-meta stab combo (hitting slowpoke and hippo super effectively) that really fucks with a lot of teams.