>>54947441There’s more to it than movepools though.
How would you deal with a bulky water like Milotic pre-split? Your options were Grass or Electric. A physically defensive Milotic did not have to fear super effective damage at all against the things it was meant to beat. Same goes for Skarmory, Swampert, Raikou, Scizor, Kingdra, Snorlax, Ludicolo, and a few others. There were type combinations who only had to fear one side of the spectrum for super effective damage (mostly Ground, Water, and Normal types).
So it was often go mixed, or be hard-walled by a ‘Mon, one which there simply was no option to hit super effectively using your attacking stat.
