Pokémon Yellow's Biggest Pokédex Changes From Red & Blue

Pokémon Yellow was an updated version of Red and Blue in many ways, including the Pokédex, which holds some stark differences from its predecessors.

Pokémon Red & Blue

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Pokemon Red, Blue, Yellow and Green OW by Wolfang62 on DeviantArt

Pokemon Types - Pokemon Red, Blue and Yellow Guide - IGN

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Sprites comparison between Pokemon Green & its updates, Red & Blue : r/ pokemon