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Gen1 + Gen2 has stadium add on which is basically competitive gym road and battle frontier with the cups.
Gen 3 has two story add ons and help to fill in the national dex.
Gen4 has add on which gives random online battle and an expanded battle frontier like road.
Gen5 has hard mode.
Gen 6 has what? fuck all
Gen 7 has what? fuck all
Gen 8 has dlc that brings fuck all to the table.
Gen 9 is an unfinished glitchy mess.
Gen1-5 are complete experiences. The rest is trash even with DLC