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The full retail copy of Detective Pikachu has been announced for Japan. This game is coming out on March 23rd 2018 and contains the first game, released in 2016. It comes in a full retail package, but on the eShop you get a discount if you own the first game. In addition to it, a special Detective Pikachu amiibo is also launching on March 23rd

Source: Serebii | Trailer 

If you purchased the first part of Detective Pikachu off the Nintendo 3DS eShop, you will get a discount on the full game 

  Artwork of the Detective Pikachu amiibo

Detective Pikachu is also confirmed for European release on March 23rd 2018

Detective Pikachu has also been confirmed for release in the US on March 23rd