This article has at least one glaring problem, namely that Pokémon Detective Pikachu did not in fact get a "Certified Fresh" rating. The site's help page provides an explanation of the Tomatometer, which lists among the criteria that a film must have a "steady Tomatometer score of 75% or higher" to be "Certified Fresh"(*). A rating below 60% would give it "Rotten" status; if it's at least 60% but fails to meet the "Certified Fresh" criteria, it gets the neutral red tomato rating, which is where Pokémon Detective Pikachu currently stands.
(*) I found examples of "Certified Fresh" films as low as 71%, so apparently the 75% threshold isn't hard and fast (perhaps they were granted the rating and subsequently received more negative reviews that dropped them by a few percentage points).
This article has at least one glaring problem, namely that Pokémon Detective Pikachu did not in fact get a "Certified Fresh" rating. The site's help page provides an explanation of the Tomatometer, which lists among the criteria that a film must have a "steady Tomatometer score of 75% or higher" to be "Certified Fresh"(*). A rating below 60% would give it "Rotten" status; if it's at least 60% but fails to meet the "Certified Fresh" criteria, it gets the neutral red tomato rating, which is where Pokémon Detective Pikachu currently stands.
(*) I found examples of "Certified Fresh" films as low as 71%, so apparently the 75% threshold isn't hard and fast (perhaps they were granted the rating and subsequently received more negative reviews that dropped them by a few percentage points).