StarDoor on 02 March 2019
I voted for it to be 4th, beating X/Y. However, I do think it's possible that it could beat Diamond/Pearl.
From the trailer, Sword/Shield look like very conventional Pokémon games; there doesn't seem to be any reason that they would capture millions of new users who aren't already part of the fanbase. If Diamond/Pearl could only manage 1.3 million more sales than X/Y on a console that sold 78M+ more units, then it just doesn't seem realistic to expect Sword/Shield to sell 6.5 million more than X/Y, regardless of how much Switch sells.
Also, Ruby/Sapphire sold 16.22 million.
