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Gen 1 is the best because it started the whole concept and introduced great Pokemon designs.
Gen 2 is the best because it added items and shinies, and Johto is a comfy ancient Japan region.
Gen 3 is the best because it added natures and abilities.
Gen 4 is the best because it added needed evolution lines and introduced the physical/special split.
Gen 5 is the best because it added triple battles, great Pokemon designs, and a great region layout.
Gen 6 is the best because of the EV reset punching bag, and added horde battles and megas.
Gen 7 is the best because um, um Z moves and Mimikyu?
Gen 8 is the best because um, um gigantamax?
You see, there is no argument for gen 7 or 8 being the best, but there are legitimate ones for gen 1-6.