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Today is Nintendo's quarterly financial release and with it comes various sales data for the Pokémon 3DS and Switch games. As of March 31st 2019, the Pokémon game sales are as follows
Pokémon X & Y: 16.39 million
Pokémon Omega Ruby & Alpha Sapphire: 14.19 million
Pokémon Sun & Moon: 16.15 million
Pokémon Ultra Sun & Ultra Moon: 8.37 million
Pokémon Let's Go, Pikachu! & Let's Go, Eevee: 10.63 million