>>42083683I might be wrong on some of these, so fair warning. It's either usually dragon or ice that limits things.
>KantoCeladon in lets go I think for both dratini and an ice type.
In older games maybe Fuschia to get a poliwhirl to trade for jynx
>JohtoOlivine if you farm horsea for dragon scales
>HoennShoal cave
>SinnohRoute 216, the first snow route, for an ice type
>UnovaMistralton cave for both bw and 2 for axew
>KalosAmbrette Town if you revive Amaura in X and Y
>AlolaRight after you beat Hala and get tauros ride to either get bonsly, or rockruff in ultra, on the blocked off portion of route 1.