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Gen 4/5 are the best games, this is non negotiable.
Gen 4 has
>An interesting new region with a great plot, good villains after Team rocket who aren't eco-hogs and amazing music
>Physical special split actually fixing the metagame and making competitive pokemon fun
>Online
>A full remake of Gen 2 that improved in every way by modernizing it, adding more pokemon and giving it the physical special split
Gen 5 has
>The best Dex to date by far
>The best region to date by far
>Animated sprites and the best battle sequences
>Evolite making every pokemon viable so people could play with their favorites
>B2W2 improved everything
>Better gym leaders
>The pokemon world tournament
Gen 1/2/3 are all outdated and have superior remakes. the only outlier is emerald, which is still good on its own.
Gen 6 went too far. Nobody asked for ugly washed out 3D visuals, France, and Mega's to get shoehorned in and ruin every possibly good thing 6 could have had.
Gen 7 looks the worst pokemon has ever been and is continuing on exactly what makes gen 6 so unlikeable and disgusting