Honestly, the number of things that can force it out is depressingly large. Since Sacred Sword doesn't have great coverage, it'll mostly be spamming hydro pump, but there's a ton of pokemon that resist that too. Pokemon that completely wall it include, Dragonite (not icy wind, but that's hardly what he want's to be locked into), Azumarill, Slowbro/king, Mega Venusaur, Tangrowth, Toxicroak, Celebi, Trevenant, latias, Jellicent, Tentacruel, and Sylveon, so I think raising it to A+ is ridiculous. If we have an A-, I think it should be there, but if its between B+ and A, I'd say B+ is more logical. It's just not as effective this gen as the other A's. Maybe if it had something better than icy wind for coverage. Otherwise I'd say the fast specially attacking water type should always be greninjaSylveon does add one more to the list of things that can switch into Specs Keldeo repeatedly. Goodra doesn't do too well against secret sword though.
252 SpA Choice Specs Keldeo Secret Sword vs. 252 HP / 0 Def Goodra: 279-328 (72.6 - 85.4%) -- guaranteed 2HKO
On the other hand, he does have trouble getting past other new stuff, such as Azumarill with its fairy typing (can't switch in with stealth rock, but can tank a hydro pump and OHKO back with play rough).
I would put keldeo somewhere in the middle, around A- (does that exist? there's nothing in it right now).
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