>>40738881having an emotional connection to any specific pokemon species is incredibly smoothbrained, you should never play a pokemon game with transfers, and the only value you old pokemon have is nostalgia/transfer shenanigans for otherwise-exclusive moves in friendlies. Pokemon home is unironically fine, the games are singular rpg experiences first and foremost, a competitive sandbox second, and a surrogate friendship simulator way beyond third.
If 400 pokemon is real though the galar dex better be fucking interesting and good/the old ones better be getting buffs. 400 is definitely less replayability/character for a pokemon game than the franchise deserves. Holding out hope for a postgame.