No, Mew is not in the regional dex.
Do you need Mew to complete the Pokedex?
You cannot fill out a complete Pokédex in either Pokémon: Let’s Go, Pikachu! or Pokémon: Let’s Go, Eevee! This is no different than other handheld Pokémon games, which encouraged trading, but limiting Mew to one-time uses in the Poké Ball Plus is sure to make some fans upset.
Do you need both Legendaries to complete the Pokedex sword and shield?
Yes. As you need both Zacian and Zamazenta (and you obviously can get only one per save), you need trading to complete the dex. Same with other exclusives, but they can be obtained via raids, too: you just need to find a raid hosted by the opposite version.
Is it possible to complete the Pokedex without trading sword?
It is possible to complete the Galarian Pokedex (i.e. catching and trading between Sword and Shield), but not the full, ‘National’ Pokedex. In fact, the concept of a ‘National’ dex was removed from the game entirely.
Do you have to catch every Pokemon to complete the Pokedex sword?
Sword and Shield’s Galar Pokédex, while smaller than the National Pokédex of Sun and Moon, can be a lot of work to complete! You’ll have to do plenty of searching, leveling up and trading to get all 400 Pokémon, but there are several ways to speed up the process.
Can you breed Mew with Ditto?
You can’t do so, as Mew is in the Undiscovered Egg Group. Undiscovered Pokémon cannot breed, even when attempting to do so with a Ditto, which can otherwise let genderless Pokémon breed with it.
Is Mew in Pokemon sword?
Mew, the originator of Mewtwo, is actually available in Pokémon Sword & Shield — even though you won’t find Mew on the Galar Pokedex. That makes Mew one of the weirder outliers you can add to your Pokémon collection, and there are only a handful of ways to get one.