Although the controversy regarding Gen 8 Pokemon games' Pokedexes subsided when The Pokemon Company announced an Expansion Pass for Pokemon Sword and Shield, many iconic pocket monsters are still missing on the Switch. Among the most beloved missing monsters are the starters from Generations 5 and 6, alongside some forgotten Pokemon like Skiddo and Gogoat from X and Y, which is something Pokemon Scarlet and Violet will hopefully fix. Still, with 60 Pokemon missing from all Switch-based entries, it's likely not all of them will return in Gen 9 — especially not in the base game, considering its Pokedex might be the same size as that of Gen 8.
On the other hand, there may be reasons why these critters are not yet returning, as The Pokemon Company might be working on new Pokemon: Legends games or remakes for Gen 5. Pokemon Black and White are next in line for a remake in the franchise, but with Gen 9 on the horizon, it's hard to predict whether these will come in the near future or not. If they do come, it's possible that Gen 6 remakes are also in the pipeline, with a release date that's probably sometime after Gen 10. These Gen 5 and 6 remakes might be why some Pokemon have not yet returned to the franchise.
Weirdest Pokemon Evolution Requirements and Why Scarlet and Violet Need Them
A popular theory is that some of these critters did not get back to the Switch because they were too powerful in their respective generations, and thus they could similarly unbalance the modern games. Examples of this include Greninja and Eelektross, which were incredibly powerful on release for different reasons. Eelektross is a pure Electric-type that could have Levitate as its ability, meaning it would effectively have no weaknesses and still
Read more on gamerant.com