Why Pokemon Scarlet and Violet Omitting Certain Pokemon Could Be a Good Thing

gamerant.com:

Despite the silence on The Pokemon Company's part about what sort of critters Gen 9 games include, Pokemon Scarlet and Violet leaks did end up seemingly revealing the entirety of the Paldean Pokedex, alongside multiple returning pocket monsters. This is one of this year's biggest leaks in the gaming industry, as Pokemon fans had access to a full list of Pokemon Scarlet and Violet's Pokedex as early as late August, over two months before launch. While there are many interesting features to Gen 9 games, a very important detail comes from the fact that a handful of Pokemon from past generations won't make the cut, which might be a good thing.

One of the biggest controversies in recent times for Pokemon games was the Pokedex cut from Pokemon Sword and Shield, which meant that only a few hundred existing critters returned to Gen 8 from past titles, compared to the usual national Pokedex including them all. Even though this is normally not good news to many players, the benefit of cutting pocket monsters from a new game's Pokedex is that troublesome Pokemon can be temporarily removed to create a healthier environment, especially for competitive battles. In Pokemon Scarlet and Violet, this could translate into not having Pokemon like Calyrex Shadow Rider or Zacian, but it's worth noting the impact that more common creatures could have.

Pokemon Scarlet and Violet Should Remedy a Major Issue With Gen 8's DLC

A great example comes from Shedinja, which is probably one of the most problematic pocket monsters to add to Pokemon Scarlet and Violet, the reason being that its Ability can cause all sorts of issues with Terastallization. Shedinja's signature Ability is called Wonder Guard, and this is the only Pokemon currently available that