You guys, at the end of the road I'm the victim, being the one that I have to analyze and write all the (LONG) rates.
Nah, just kidding. Don't let a long rate discourage you, sometimes it is required, and truthfully we can see how you are dedicated.
As promised, we'll make the rates for the Final public:
Nedor's rate shows us an important point. It has been discussed already but the team is slow even for a stall team by today's ORAS standards, effectively having no real "solid" backbone and giving the majority of wallbreakers and/or stallbreakers an easy time. The most important examples would be Tail Glow Manaphy, Mega Charizard Y, Mega Gardevoir, Hoopa-U , LO Tornadus-T and Kyurem-Black. Setup sweepers are also problematic, the most glaring ones being SD Talonflame, Mega Pinsir, Belly Drum Azumarill, Power up Punch Mega Lopunny and SD Mega Heracross.
Another important point is that this team has troubles on taking status moves. Specifically talking, the team by itself does not have many problems at tanking status moves, or Scalds, however there are two threats that can capitalize on this, being Rotom-W and SD/BU+Wow Talonflame. Especially if we look how Manaphy has an offensive EV spread, making it less durable in the long run.
With the threats established, Nedor suggests his first change, which is Zapdos over Skarmory. With this change the team has a Defogger that can now use attacking moves in order to scare threats. Zapdos also helps against Azumarill, Crawdaunt and Mega Pinsir in a single package.
The next change is Special Defensive Hippowdon over the current one, which allows Hippowdon to tank hits from threats like Thundurus, Mega Charizard-Y (if sand is present and Charizard is Timid), Life Orb Gengar and Mega Diancie better.
After this Nedor suggests switching Fake Out with Toxic in order to have a final measure to weaken Mega Charizard-Y if the situation requires it. Toxic also helps against threats that give Volcarona problems such as Talonflame and special defensive Mega Slowbro.
Lastly Nedor recommends WishTect Unaware Clefable over Amoonguss as an answer for setup sweepers such as Serperior, Hawlucha and Mega Lopunny.
Now then, before I go further let me state this: I'm not bad.. I'm just drawn that way.
First off you make an important point Nedor that the team is slow and passive, yet you remove the only member of the team capable of outspeeding Hoopa (not that Manaphy wins a 1v1 confrontation against Hoopa but at least it has chances if Hoopa has been weakened). Hippowdon's EV spread change also means that Life Orb Hoopa will 2HKO it. Furthermore Slowbro adds a Dark weakness and the only resist, Clefable, is defeated by Gunk Shot. Overall the suggested changes make Hoopa a much bigger problem for the team.
Having Clefable as an answer to setup sweepers is okay, however it makes the team even more passive. For example, Mega Gyarados now can easily setup a Substitute / Dragon Dance on Mega Sableye and Slowbro. Zapdos has problems if Stealth Rock and Sand are present, only have a very small 5% chance to avoid the 2HKO at +1. Discharge has to rely on the para (just like Mega Gyarados can hope for a flinch), since it cannot OHKO Mega Gyarados. As a matter of fact, picking Discharge over Thunderbolt is a much riskier choice in this situation since Thunderbolt gives you a very high chance to OHKO Mega Gyarados after a Substitute and Stealth Rock/2 sand turns while Discharge does not.
Perhaps though, a much better example would be Mega Altaria. Having removed your only Steel you now have no reliable Fairy resist. Mega Sableye, Volcarona, Hippowdon, Zapdos and Slowbro are setup bait and Clefable cannot take 2 Returns from an offensive version. It can also simply Roost off the damage once it's weakened and shrug off Zapdos' HP Ice. The team no longer has Clear Smog+ Sludge Bomb Amoonguss and Skarmory and has to pray that Stealth Rock isn't on the field.
Additionally, Hippowdon now has chances to die at full against Adamant Charizard X, and it's not that hard to setup on it. You have to sacrifice Mega Sableye in order to poison it and then hope to finish things with Slowbro, since a +1 Dragon Claw has a 69% chance to 2HKO Slowbro while neither Scald nor Psyshock 2HKO. Charizard also sets up quite easily on Zapdos, Clefable, and Volcarona.
Back to Discharge, there is another problem for this choice in that it doesn't even 3HKO Bulky SD Mega Scizor while a paralysis will mean that it cannot be burned by Mega Sableye. There is a connection between the majority of these threats, in that they are all setup sweepers that for the most part are able to take on Unaware Clefable and come out on top.
By the way, since I talked about Charizard X, earlier you mentioned how Mega Charizard Y can be checked by Hippowdon. However for it to be a reliable check, Charizard needs to be Timid and you must have Sandstorm on the field. However there is no real reason for Charizard to use Solar Beam against this team since Fire Blast still allows it to KO everything; even Slowbro after Stealth Rock is 2HKOed. The situation where Hippowdon can come in is only after Charizard has Mega evolved, which can be gained only if you use Protect on Clefable or sacrifice something earlier. If Charizard is Modest then Hippowdon after Stealth Rock has more than a nine out of ten chance to die from two Fire Blasts.
Speaking of other powerful special wallbreakers Mega Gardevoir remains a problem for this team, seeing as it no longer needs Taunt for Skarmory. Nothing on the team can still take it on as the only Fairy resist Volcarona can't do enough damage with Fiery Dance. Keep in mind this is only for Timid Mega Gardevoir; Modest would be much worse.
Now, as for changes, I wouldn't have removed the only Steel to be honest. I agree with your reasoning on Defog Skarmory, but removing the only Steel opens quite a lot of problems. I don't remember who but in round 2 someone posted an EV spread of unaware Clefable that helped against Thundurus, Life Orb Serperior and Ice beam from Kyurem-Black, I would consider it since as it stands there are still chances that Kyurem-B can 2hko Clefable, and the only two ice resist are either lacking in power and weak to Fusion Bolt, or rely on the removal of Stealth Rocks every time it comes in.
I would have also considered the option to give more speed to Zapdos. Earth Plate Landorus-T with SD can rip you apart quite easily and Bisharp remains a problem since Volcarona is the only one which can outspeed it. A coinflip between Sucker Punch and Knock Off every time is not something desirable. It's not as glaring a weakness like the other threats I mentioned (especially Hoopa-U, Mega Altaria, Mega Gardevoir, Mega Charizard Y) but it's still problematic due to how Clefable and Slowbro are scared of it.
I must also ask: is Calm Mind Slowbro really necessary on this team? I'm saying this because Thunder Wave would surely help at not conceding too much momentum. For example, Clefable would love outspeeding Mega Altaria, just like Hippowdon with Mega Charizard X/Y at +0, and it would also help against Hoopa and Mega Gardevoir by not making Slowbro a complete fodder relying on luck. You stated it was a "win condition" but is it really worth it?
Overall, many congratulations for your ride Nedor! I vouch what IB said, you have done a good job and are one of the most promising Team Rater at the moment. It wouldn't be strange to see you get the badge soon.