I missed some of the Blaziken conversation, but now I got this.
Continuing on from what Blue Harvest said, if Blaziken is running Protect or Substitute, then it won't even need Speed EVs, as it will be able to easily get in an extra turn of Substitute. Therefore you can throw the rest of its EVs into HP, allowing to (as BH also said) survive attacks like Surf much more easily. That being said, it will lose some coverage by running one of those moves. If it doesn't run one then it will likely run either Stone Edge or Thunderpunch. Iirc, Stone Edge will have a chance to OHKO Tentacruel, and most Waters can say goodbye when they take a Thunderpunch to the face.
Blaziken may be a difficult thing to counter, but it's not Uber. Entry hazards will still be useful, as there are only 2 new spinners. Blaziken will be affected by all EHs, SStorm, Hail, and other passive damage. A strong revenge killer will be able to take it out. Heck, Azumarill actually makes a decent counter to Blaziken.
Now, if there's anyone going to Ubers, it'll be Shanderaa, Politoad, and Ninetails. If I'm remembering right, Smogon has tried putting Drought and Drizzle on the Shoddy server before on certain Pokemon, just to see what would happen. Weather teams absolutely dominated the metagame. Now yes, weather teams can be countered by certain Pokemon strategies and combinations, but the reason that Drizzle/Drought, Salamence, Garchomp, and a few other Pokemon were banned weren't because they were uncounterable, but because the metagame was so centered around them. As d0nut said one time, you could put Drizzle on a level 1 Magikarp that wouldn't be able to level up or change to Gyarados and it would still be Uber. It just makes Rain teams too dominating.