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Removed in Gen 3
>Physical effect of the day/night cycle on overworld (back in Gen 4)
>Transfer of Pokemon from the previous Generation (back in Gen 4)
Removed in Gen 4
>Pokemon Contests, and all the associated stats and berry blending
Removed in Gen 5
>Walking with Pokemon
>Game Corner/Game Corner replacement
>Underground
>Ball Seals
>Secret Bases (They returned later then got cut again)
>Day/Night Music. (back in Gen 7)
>Radio
>Running Shoes toggle
Removed in Gen 6
>Difficulty Options
>Battle Frontier
>Proper Gym Leader rematches
>Seasons
>Gym Leader Final Pokemon Music
>Unique Gym Music
>Hidden Grottoes
>Join Avenue
>Phenomena (Dark Grass, Shaking grass, Rippling Water, Dust Clouds)
Removed in Gen 7
>In-game National Dex
>Dex-Nav
>Horde Battles
>Triple and Rotation Battles
>Super Training
>Soaring
>O-Powers
>PSS
>Secret Bases
>Bike
>Generic Trainer encounter themes
THIS ISN'T NORMAL. IF ALL THIS WAS IN THE GAME AND NOTHING ABOUT THE RPG CHANGED, EVERYONE WOULD BE HAPPY.