Quoted By:
Rank the Pokemon that are obtainable in every core series game so far based on how likely they are to not show up in Galar at all.
>Jigglypuff, Wigglytuff
>Zubat, Golbat
>Horsea, Seadra
>Goldeen, Seaking
>Magikarp, Gyarados
Note that the last time a Pokemon was taken off this list was Doduo and Dodrio, available in every core game up until Alola. It could happen to anyone.
For bonus autism points, you may also include Pokemon that are obtainable in at least one game of every region, but not in every game. (eg Ditto, the Abra, Geodude, Machop, Psyduck, Rhyhorn and Staryu lines)