Nintendo revealed its Earnings Release: Six Months Ended September 30, 2019 report which indicted that Pokémon Let's Go, Pikachu! and Pokémon Let's Go, Eevee! has sold 11.28 million units, up from the 10.63 million units announced in their Consolidated Results for the Years Ended March 31, 2018 and 2019 report released earlier in 2019. Top Selling Titles Sales Units figures were also updated and a list of the sales for Pokémon games is below.

Consolidated Operating Results:

During the six months ended September 30, 2019, for Nintendo Switch, a new model with extended battery life launched in August, followed in September by Nintendo Switch Lite, a system dedicated to handheld gameplay, which is compact and lightweight, making it easy to take on the go. Nintendo Switch titles slated for release include Ring Fit Adventure (October), Luigi's Mansion 3 (October), Pokémon Sword and Pokémon Shield (November), and Animal Crossing: New Horizons (March 2020).

Top Selling Titles Sales Units - As of September 30, 2019

Pokémon X / Pokémon Y - 16.42 million pcs.
Pokémon Sun / Pokémon Moon - 16.17 million pcs.
Pokémon Omega Ruby / Pokémon Alpha Sapphire - 14.23 million pcs.
Pokémon: Let's Go, Pikachu! / Pokémon: Let's Go, Eevee! - 11.28 million pcs.
Pokémon Ultra Sun / Pokémon Ultra Moon - 8.57 million pcs.

Sources: https://www.nintendo.co.jp/ir/en/finance/software/3ds.html