Valk, Plagueis, Sheev and Krayt vs 4 of your choice
Everyone at the height of their powers.
Choose four people who can defeat this team. Both sides get a day to become fully familiar with each other's abilities and plan their battle tactics. They don't know who they are fighting.
Battle takes place on a flat, neutral arena.
You cannot choose The Ones, Bedlams, sentient planets or other cosmics/deities.
__________________ “The galaxy must experience the pain of death and the rapture of rebirth as I have. I will bring chaos. It is time for war.”
The only real disputable outcome is Windu vs. Plagueis, but that honestly won't matter given that the other three have a clear advantage. You can rearrange things however you want and the only possible weak link is that Mace Windu may be below Plagueis.
EDIT: forgot about Knightfall Vader
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4 Lukes, assuming they fight to their proper capacity, destroy the team. But I guess that isn't allowed.
You have essentially selected 4 out of the top 5 Sith. I would put Krayt on par with Yoda or ROTS Sidious, with both Plagueis and Valk being a notch below them.
In that case, the opposing team would be:
Luke-Beats anybody here solidly, assuming he fights at his best level, which he, barring stupid plot reasons why he doesn't do so most of the time, should. Not to mention, we take characters at their best, generally.
Yoda-Beats Plagueis or Valkorion. Might beat Krayt.
Zonakin( or whichever iteration of Anakin as of ROTS that is at its best)-Beats Plagueis or Valkorion, and might beat Krayt.
If you accept amped Nyax's scaling over DE Palpatine, he finishes off Krayt pretty easily. Even otherwise, seeing as he had enough power to "crack a planet in half", he would be in with a more than good chance. Depending on how you take his hype, of course.
Else, either Starkiller or Mace can handle Plagueis or Valkorion. I am not sure how Yoda or the prime iteration of Anakin would fare against Krayt. They might beat him, or they might lose, but they will at least keep the battle going on for a long time, more than enough time for the others to beat Plagueis or Valkorion, and then cumulatively wreck Krayt. Luke would eventually win his battle with Palpatine.
__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."