Making a masterpiece out of a core isn't easy, and most of the listed ones here are basic ones who are overall solid, but need backups in order to deal with their weaknesses.
However it is another thing when a core straightly loses to one of the most used mons out there, such as Tapu Koko.
This being said, i could probably add it and put a bold statement in the description with "Please add something that can deal with Koko and bring it in 90% of the games"
Yes, and Fini, Steela, Zard X is one of those overall solid cores that requires other pokemon to help deal with their weak matchups.
Also, Tapu Fini, Celesteela Charizard X does not lose to Tapu Koko on Team preview. Bulky Charizard X walls every variant of Tapu Koko and that includes Choice Specs Thunderbolt in Electric Terrain which does not 2HKO. Charizard X can actually lead vs. Landorus-T, Hippowdon or Tapu Fini and puts pressure on these pokemon both due to Will-o-Wisp, Thunder Punch vs. Fini and the fear of Charizard Y. It also lives any move from those pokemon at which point you can pivot into other pokemon if need be. Tapu Fini can also lead fine vs. Tapu Koko and beat it 1v1 due to terrain switch. Is Tapu Koko a threat? Sure, but I think this applies to the vast majority of cores mentioned here. I'm pretty sure if you mentioned any core here, I could pick out a glaring weakness to a top BSS pokemon. I'd argue Thundurus-T is more of a problem to the core than Tapu Koko.
My opinion, most Koko matchups are a skill matchup in the opponents favour but you have the tools to win even if you are just considering those three pokemon and no secondaries.
Also, another opinion which is probably why I rate the core higher than you, I don't think Tapu Koko is that good. In the viability rankings for example, I think it is easily the worst A+ pokemon.
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