You gotta play the Yokai Watch games. They're phenomenal! Definitely some of the best games on the console. They're also some of the biggest, it's impressive how much the developers managed to fit onto a 3ds cartridge.

btw you should know that the 2nd game did the Pokemon thing where 2 versions (Bony Spirits, Fleshy Souls) got released together with a 3rd definitive version sold later (Psychic Specters). The 3rd game did it too, but only the definitive version got localized so don't worry about it.