If you own a physical Japanese copy of Yo-kai Watch 4 Purapura and a homebrew-compatible Nintendo Switch (unpatched console), you can legally dump your own ROM using tools like . This is the only 100% legal way to obtain a "ROM" for emulation.
If you find the ROM hunting process too risky or legally grey, consider these official alternatives: Yo-kai Watch 4 Purapura Rom
: Features a third-person 3D overworld and a real-time action-RPG battle system where humans (Watchers) fight alongside their Yo-kai. PlayStation Store ROM and Localization Details If you own a physical Japanese copy of