Nintendo released its Consolidated Results for the Years Ended March 31, 2019 and 2020 on May 7th, 2020 and it revealed that Pokémon Sword and Shield have now sold a combined 17.37 million units.

Nintendo's Consolidated Results for the Years Ended March 31, 2019 and 2020

For the fiscal year ended March 31, 2020, Nintendo Switch Lite launched in September as a compact, lightweight, and easy-to-carry dedicated handheld system, and Nintendo Switch performed very well without losing momentum, resulting in significant sales growth for the entire Nintendo Switch family. Looking at software, Pokémon Sword and Pokémon Shield became big hits, posting sales of 17.37 million units, and Animal Crossing: New Horizons, released in March, sold 11.77 million units, which is now the best start ever for a Nintendo Switch title.

In addition, we plan to distribute The Isle of Armor for Pokémon Sword Expansion Pass and Pokémon Shield Expansion Pass by the end of June as the first-ever add-on content for the Pokémon series, and to follow that up with The Crown Tundrain the fall.

Pokémon Sales as of March 31, 2020:

Pokémon Sword and Pokémon Shield: 17.37 million
Pokémon X and Y: 16.45 million
Pokémon Omega Ruby and Alpha Sapphire: 14.27 million
Pokémon Sun and Moon: 16.18 million
Pokémon Ultra Sun and Ultra Moon: 8.77 million
Pokémon Let's Go, Pikachu! & Let's Go, Eevee: 11.97 million

Source: https://www.nintendo.co.jp/ir/en/index.html