There's currently sinnohpokedex (platinum), kalospokedex, hoennpokedex (gen6) and alolapokedex (USUM) rules for regional pokedexes. So it's missing kantopokedex (gen 1 and let's go), johtopokedex (gen 2 and gen 4), hoenndex (gen 3), sinnohpokedex (Diamond/Pearl), unovapokedex (1 and 2), alolapokedex (SM) rulesets. You can see information on them here: https://bulbapedia.bulbagarden.net/wiki/Regional_Pokédex . Some are more worthwhile to add than others.
In addition, it seems like there should be a way to ban/unban by generation they were introduced in (though this is easier to work out I guess).
In addition, it seems like there should be a way to ban/unban by generation they were introduced in (though this is easier to work out I guess).