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I think Porygon should be a physical attacker so the progression goes Phys Attacker -> Tank -> Sp Attacker. And it literally has edges. Base stat total buffed to 460 (P2 is 515 and P-Z is 535 for comparison). 60/60/70/85/75/40 -> 70/95/80/60/75/80 . New Move: Shift Gear (it just makes sense). Nobody would use it, it'd still be garbage (unless you give it Extreme Speed or something), but I just think it makes sense.
Similar buffs should be given to all mons that used to be fully evolved once upon a time. Especially Onix.