Are you seriously trying to argue that its viability is lower because prediction exists…and then wrote out a whole paragraph explaining what prediction is…Maybe it is A, but I would not say comfortably. :) The problem is, it has quite mediocre defenses (91/90/90) and the set that from this forum seems to give is viability (specs) is predictable.
(Below is a scenario with basically displays the weaknesses of Specs with Keldeo's STAB: feel free to read but if you don't want to you get the point).
Imagine I have a talonflame on the battlefield. Lets assume this Talonflame happens to not have a choice band, just assume, because choice band priority brave bird OHKOs Keldeo. Because Modes Specs Keldeo does 267.7% minimum with hydro pump, it will probably use hydro pump. The talonflame's trainer is well aware of this, so they might switch to something that is immune (Water Absorb or Storm Drain pokemon) or something that won't take much damage (Dragonite, Trevenant). These Pokemon can take advantage of a switch: the former with Dragon Dance or the latter with (sub)seed, or can outright go for a kill (especially in trevenant's case). Same situation with its fighting stab, ghost pokemon are certainly immune.
Also, its speed is impressive, but dwarfed by most choice scarf pokemon. Even worse is that heliolisk has 1 more point of speed, dry skin, and OHKOs with Thunderbolt. I would nominate Keldeo for B+ or A- rank, personally.
EDIT: Somebody said that Specs Keldeo 2HKOs Dragonite with SR. That's mostly wrong. With Multiscale, hydro pump does 26.8% max, stealth rock does 25%, and without multi scale hydro pump does 49.5% average. Assuming Hydro Pump does max damage the first time, there is still about a 40% chance that Dragonite escapes damage! I wouldn't blame you for saying "60% chance of KO is close enough to a KO for Keldeo to 2HKO Dragonite with SR". The problem is that these results were for a 4 HP adamant Dragonite! For an actual defensive dragonite, the calcs are much different, as Keldeo cannot 2HKO with SR up. (that calculated with 252 HP, 4 Def, and + SpDef nature)
No shit most Scarfed Pokes outspeed it. Scarf Pokes outspeed almost everything that doesn't have a Scarf. Heliolisk has absolutely no business playing in OU to begin with and gets wrecked by Secret Sword, so it's far from a safe switch.
Your Dragonite calcs are also completely wrong because once SR does its 25%, that breaks Multiscale. Also absolutely no one in their right mind is running 252 HP / 252 SDef on Dragonite, I don't even know where to start with that ridiculous assertion.
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