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Because people don't understand that early-gen pokemon were simple because they had to be.
People eill say this about literally any videogame series spanning multiple generations:
>wow new pokemon are so overdesigned and colorful, why do they use so many colors fffff
>the new Castlevania games are so overdesigned and edgy, why does everyone wear long coats and capes? Remember when it was just a buff guy in a kilt?
>omg Megaman X? Megaman ZX? Barely even looks like Megaman anymore, with all those random details on his armor
>why is Zelda so gothic now? Remember when it was colorful and storybook-ish?
A new console is a chance for developers to try new things. Retro game characters HAD to be kept simple and colorful, because they were designed to look good at extremely low resolutions and only a limited palette.