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>Introduces physical/special split
>Introduces walking pokemon
>Introduces double battles
>Introduces wifi battles
>Introduces GTS
>Introduces berries
>introduces pokeball accessories
>First 3D assets in a pokemon game
>Masuda methrod and Chaining for shinies
>Great soundtrack
>Birth of competitive Pokemon as we know it
>The underground to explore, has secret bases as well
name one reason gen 4 isn't based