Why is Scizor UU in Gen 9?

Question

Kleavor is Uu which makes sense but Scizor is also Uu right now. WHY? Scizor is way better than kleavor I thought?

this is based on Pokemon showdown. I'm new sorry if I did something wrong

Comments

Are you referring to Singles or Doubles? In Singles, Scizor is in SV UU (and UU in NatDex formats) while Kleavor is in RU(Also RU in NatDex formats). In Doubles, Kleavor is DUU(Doubles UU) while Scizor is (DUU), meaning it is below Double Used.

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A Pokémon’s tier is solely determined by its usage. Scizor might be a good Pokemon, but if its usage does not cross the threshold requirement for OU (4.52% usage rate), it will not be classified as OU.

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Scizor isn't the most "viable" Pokemon in OU either. If every Pokemon got usage according to its viability, Scizor probably still would be UU.