Some of these checks/counters seem valid, but there are some things I don't like here I want to point out.
1. Porygon2 is D tier. I myself think it should be C at least, but the point is, you should not have to run something that crappy just to beat one Pokemon.
2. Gardevoir-Mega dies to Scarf Iron Head Kyurem-Black.
3. Mega Heracross requires a shit-ton of physical bulk to tank Adamant 252 Attack SS (252+ Atk Teravolt Kyurem-Black Subzero Slammer (200 BP) vs. 252 HP / 164+ Def Heracross-Mega: 307-363 (84.3 - 99.7%) -- guaranteed 2HKO). Arm Thrust Megacross fails to KO back, and Close Combat variants lose to UOP Bulky Icium. Since you are left with just 92 Attack EVs without a boosting nature, this also means that Mega Heracross' main niche, being it's immense wall-breaking potential, takes quite a cut. A similar situation goes for Keldeo, though not quite as bad.
4. Tapu Fini and Primarina fall to Banded Kyurem (252 Atk Choice Band Teravolt Kyurem-Black Fusion Bolt vs. 252 HP / 0 Def Tapu Fini: 354-418 (102.9 - 121.5%) -- guaranteed OHKO).
5. Ok, so bulky Mega Metagross wins. But what about speedy variants?
6. Not sure if these are used much, but Tapu Lele gets cucked by speedy Icium/Band. Also, Scarf Moonblast is not a guaranteed OHKO.
Everything else you listed, admittedly, does do well as a counter. But it's still slim pickings.
Porygon2 is not a crappy pokemon, just because it is not used as much, does not mean it is bad. It beats Charizard-Mega-X, Gyarados-Mega, Metagross-Mega, Mimikyu, Dragonite, and walls off many other pokemon that lack a super effective move.
Gardevoir-Mega obviously runs defense... I mean come up buddy, step it up; I have said about Gardevoir-Mega's bulk in a post before this one.
Keldeo can take a Fusion Bolt with relative ease.
I mentioned Heracross-Mega's weird bulk, well, when I mentioned his weird bulk. And weird it is, but to invest in 185 Attack is not as necessary. It is also the most popular spread.
I though that we did not want to talk about Banded/Specs Kyurem-Black, but if we are, then Tapu Fini and Primarina will lose, yes.
And to speak of speedy Icium Z and Band is just a waste of Kyurem-Black's potential. Tapu Lele will beat Kyurem-Black at least 88/100 times on a ladder. I also did not mention scarf Moonblast anywhere.
To add on, Metagross-Mega always runs bulk, to take on the not broken Tapu Koko.
There are at least 10 mons here. I do not think that is slim picking.
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