Yo-kai Watch 1 out of the main games at least. Yo-kai Watch one seems to just have much less requirements to beat the game, like in 2 and 3 there are key quests which are not really in 1. Yo-kai Watch 1 seems to have less of an emphasis on story as well. The switch version is slightly faster than the 3ds version due to infinite stamina.

idiom???

Ah. Pretty sure japanese is the fastest.