Pokémon Scarlet and Pokémon Violet will come this year (2022) for us. From what we've seen in the trailers, if you don't see, check official pokemon channel on youtube and watch him, pokemons from the old gens appear not to have been cut from the game, since they appeared in Trailers(We've seen Lucario, Pikachu, Magnemite and Seviper, looking only Gen 1-5 mons(If they bothered to put Seviper, who is not even remembered in story mode, do you think they would cut any pokemon like Garchomp or Hydre