Update (August 8)
Level-5 has posted a trailer for Yo-Kai Watch 1 for Nintendo Switch, which we've added below.
Original (July 29)
Level-5 has today revealed Yo-Kai Watch 1 for Nintendo Switch in Japan. This is an HD remaster port of the first-ever Yo-Kai Watch game which was released for Nintendo 3DS in Japan in 2013 and later localized in the West in 2015.
All copies of this game - both physical and digital - will also come with a serial code that can be inputted in the Nintendo Switch to unlock a new Yokai called "Chairman Ikakamone" in Yo-Kai Watch 4, which has been recently released in Japan.
Yo-Kai Watch 1 for Nintendo Switch will be released in Japan on October 10. An English localization of this HD port has yet to be announced as of this writing.