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Difficulty, presentation, characters, new Pokemon, last gen to have Sprites instead of bad 3D models, music.
Every game after Gen 5 has been lower quality in almost every way.
The only thing I dislike about Gen5 is lack of Battle Frontier, but they have similar things. Subway, Black City/White Forest, PWT.
The only good thing about some of the modern games is some of the new items, abilites, and attacks.
Rarely do new gens have characters or Pokemon worth a damn, but the good ones are very good.
Gen 6 and Gen 8 killed my interest in the series. Skipped 7 entirely because of how much I dislike XY