>Gen I
Pidgey and Nidoran
>Gen II
Phanphy, Zubat (Applies to Gen II beyond), and Gatsly
>Gen III
Ralts, Slakoth, Shroomish, and Nicada
>Gen IV
Starly, Shinx, Magikarp (Applies to Gen III beyond, can be considered as a good pick since Gen I since Hyper Beam was physical), Buziel, and Abra
>Gen V
Patrat, Lilipup, Blitzle, Drillbur, Sweaddle, and Venipede for BW, plus Riolu, Mareep, Huge Power Azurill, Magby, Elekid, Magnemite, Growlithe, Koffing for BW2
>Gen VI
Bravest Bird, Honedge, Bunelby, Scatterbug, Huge Power Azurill, Flabebe, abd Ralts
Goddamn Gen V had a ton of good early game mon that scales to lategame
