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These Pokémon were not in the Galar or Paldea dex in their base rosters. 197 non-legends / starters. Some have only been coasting off of expansions like Platinum, B2W2, XY, or DLC to be in a regions pokedex past their debut. This is the last time they were in a beginning generation games regional dex. Pre-Switch era this includes
>10% of Gen VII or 5 / 52
>11% of Gen VI or 6 / 57
>23% of Gen V or 31 / 134
>30% of Gen IV or 25 / 84
>37% of Gen III or 43 / 116
>28% of Gen II or 24 / 85
>46% of Gen I or 63 / 137