During TGS 2019, Level-5 revealed that Blossom Heights will be added to Yo-kai Watch 4 as a paid DLC, alongside multiplayer that allows multiple people to play together locally.
Chapter 5 Boss Battle! We're Halfway! Let's Play Yo-kai Watch 4 #20
Yo-kai Watch 4 Update To Let Players Play Together, And Return To Blossom Heights - Siliconera
Yo-kai Watch 4++ details multiplayer mode, new quests, and more new yo-kai - Gematsu
Yo-kai Watch 4 Update To Let Players Play Together, And Return To Blossom Heights - Siliconera
Yo-Kai Watch Blasters' Revealed For Western Release This Fall
Yo-kai Watch 4++ Re-release/Paid Update Announced for December 5 Release, Details Inside : r/yokaiwatch
Here's The First Screen Of Yo-Kai Watch 4 On Nintendo Switch - My Nintendo News
Yo-kai Watch 4++ details multiplayer mode, new quests, and more new yo-kai - Gematsu
Yo-kai Watch 4 Update To Let Players Play Together, And Return To Blossom Heights - Siliconera
Yo-kai Watch 4 and Yo-kai Watch 4++: Software updates (latest: Ver. 2.2.0) - Perfectly Nintendo
Yo-kai Watch 4++ Re-release/Paid Update Announced for December 5 Release, Details Inside : r/yokaiwatch