Warning: Got a bit carried away with calcs and such, so beware.
The Lucky Absol , I really don't like the idea of using "random AV Pokemon" to check Kyurem. The fact that you're using AV on shit like Gallade, Raikou, and Meloetta (to an extent; this is actually a legit cool set) should show just how fucked up Kyurem is. But I'll get into why I feel they aren't even safe a little later. I've already explained why I feel Azelf is broken. You listed Delphox and Reuniclus as reliable answers to it, but take a look at this:
4 Atk Life Orb Azelf Knock Off (97.5 BP) vs. 4 HP / 0 Def Delphox: 289-341 (98.9 - 116.7%) --
guaranteed OHKO after Stealth Rock.
252 Atk Choice Band Azelf Knock Off (97.5 BP) vs. 252 HP / 252+ Def Reuniclus: 268-316 (63.2 - 74.5%) --
guaranteed 2HKO after Leftovers recovery.
Yeah, Azelf simply needs Knock Off to kill off Delphox. For Reuniclus, there's no guarantee that Azelf is special. If you come across a Band set, Reuni is toast. Put simply, you cannot safely counter Azelf. Is there answers to every individual set Azelf has? Absolutely. If it's special, then Delphox and Reuniclus are generally ok unless Zelf carries Shadow Ball (which is rare af) But should it be mixed, or even worse, Banded, then these two checks suddenly become quite worthless.
Now, to Kyurem. The reason I don't like the argument of using "random AV Pokemon" to handle Kyurem is its ability to go mixed or physical. Let's take the Scarf set just as an example. This will use a moveset consisting of Draco, Ice Beam, Earth Power, and Outrage, a very plausible moveset for a Scarf Kyurem:
4 Atk Kyurem Outrage vs. 252 HP / 0 Def Gallade: 231-273 (67.9 - 80.2%) --
guaranteed 2HKO after Stealth Rock.
4 Atk Kyurem Outrage vs. 0 HP / 0 Def Raikou: 205-243 (63.8 - 75.7%) --
guaranteed 2HKO after Stealth Rock.
4 Atk Kyurem Outrage vs. 248 HP / 0 Def Meloetta: 202-238 (50.1 - 59%) --
guaranteed 2HKO after Stealth Rock
Yeah, they're all in deep shit. And if you use them to take a hit early on in the match, then these 2HKOes turn into OHKOes very easily outside of Meloetta. And before you say "Outrage sucks on Scarf", I don't want to hear it. Outrage gives Kyurem a very legitimate
cleaning move for when the opponent only has special tanks / walls left (high possibility due to Kyurem's special attacking presence) Something that
atomicllamas and I talked about a bit on irc last night was the possibility of physical Kyurem. While it has a horrid movepool, we did come up with a physical SubRoost set that quite simply shits on a lot of common responses and would probably look something like this:
Kyurem @ Leftovers
Ability: Pressure
EVs: 52 HP / 220 Atk / 236 Spe
Nature: Adamant
- Substitute
- Roost
- Dragon Tail
- Iron Head
EVs are debatable, but if this thing has Spikes support, good fucking luck. Anything that can't break its Sub gets Pressure stalled. Oh, and if you can, you're just getting phazed out with Dragon Tail. Makes all of those AV mons cry. And it has Iron Head for random Fairy-types like Aromatisse and Granbull thinking they can beat Kyurem. So, yeah, to say this thing is stupid good and capable of beating most things used for checking it would be an understatement.
/wall of text