There are rumors of a post-game update to the dex I heard. Also worth noting that Mythics don't show up in your Dex until you see them the first time in Sword and Shield from what I'm hearing, so there could be a good many Mythics added via event codes.
Hopefully the post-game dex update rumor is true, because 400 is just sad. Gamefreak said that fan favorites would be prioritized since the National dex was cut, but there are tons of fan favorite evolutionary lines missing like all prior gen starters aside from Charmander, tons of Legendaries, Alakazam, Luxray, Garchomp, Houndoom, Salamence, Metagross, Nidoking, and Nidoqueen. Meanwhile, Garbodor and Stunfisk, 2 of the most hated pokemon of all-time, not only return, but get Galarian forms, smh. There are several other unpopular Pokemon that made it in instead of fan favorites as well.Last edited by shikamaru317 - on 04 November 2019