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ITT: We name the greatest additions to the series by Gens.
>Gen 1
Created the franchise. Duh
>Gen 2
Breeding
>Gen 3
Abilities
>Gen 4
Physical/Special split
>Gen 5
Infinite TMs
>Gen 6
Horde Battles for EV Training
>Gen 1
Created the franchise. Duh
>Gen 2
Breeding
>Gen 3
Abilities
>Gen 4
Physical/Special split
>Gen 5
Infinite TMs
>Gen 6
Horde Battles for EV Training