definitely think best alakzam set is cm + 3 attacks. if you're using a turn to recover on zam you're not using its offensive pressure well enough. its only two checks are muk and metal. both dont really like repeated switchins into shadow ball/gleam with rocks up. eventually you just get to a point where you just sweep with +1. the lack of recovery isn't a problem because you should never really take and damage that isn't rocks.
I've dropped Recover as well, I never find an opportunity to use it ; things that could be recover stalled usually carry a status move that will cripple your sweep anyway. What's the best 3rd attacking move for Zam though ? I'm still quite unsure of what some Mons can and can't learn in this game.
About the current viability rankings :
Melmetal : I've finally stopped using MemeMetal and I'm still winning, so I think he might be okay in A-Rank.
M-Aero : I almost never evolve Aerodactyl and only fought two M-Aero so far, so I can't really tell. But the fact base Aero is that good and can potentially be mega-evolved is playing in his favor for sure.
Zapdos : Weak to SR, and his obvious method of recovery is easy to play around with the omnipresent EQ. Considering it's played as a pivot, that hurts him a lot. Still, I usually lead him if leading Aero seems risky, because nothing but ground types likes switching into T-bolt, and you can just predict ground switches with U-turn. He's also fast enough to attack again. A-Rank seems fair.
Aloan Muk : is weird ; he's necessary but usually all he does is sponge 3 hits over the course of the match and then die.
Mega Gyarados : Used more and more every day. He's pretty bulky and nothing likes switching into it. Should be higher.
(M-)Gengar : they definately shouldn't be that low.
Cloyster : Didn't see a lot of them but that thing is spooky ; it actually has the bulk to set up and then outspeeds the entire metagame with a speed+ nature. However, even after a boost, it seems like he still lacks the damage to grab crucial OHKOs without significant prior damage.
+2 0 SpA Cloyster Hydro Pump vs. 0 HP / 0 SpD Mew: 109-129 (62.2 - 73.7%) -- guaranteed 2HKO
Venomoth : Has anyone ever swept with this thing ?