Rank

Rank is a measurement system within the Yo-kai Watch series, which goes from E to S. The higher the rank, the faster a Yo-kai can become more powerful when they level up. Because of this, some lower ranked Yo-kai may lose playability as higher ranked Yo-kai become more and more commonplace.

The Yo-kai Watch itself can also be given upgrades in the games in order to find Yo-kai of the same Rank the Watch is and to undo Watch Locks, special energized doors that boast a given Rank that a player's Yo-kai Watch must be in order to unlock them, of the same Rank as the Watch.

Rank E
E Rank is the most basic level for all Yo-kai, as well as the standard Rank a Yo-kai Watch is set towards. At this rank, the Yo-kai Watch can only find E-ranked Yo-kai.

Rank D
D Rank is the second-lowest level for all Yo-kai. To upgrade the Yo-kai Watch to this rank, one has to go to Timers & More, then collect the Watch Cog, Screw, and Spring, get to the Hot Springs at night with Baku's help, evade Gargaros during the game's first Terror Time while doing so, and defeat Sproink.

At this rank, the Yo-kai Watch can unlock D-ranked Watch Locks and is able to find D-ranked Yo-kai.

Rank C
C Rank is the mid-lowest level for all Yo-kai. To upgrade the Yo-kai Watch to this rank, one has to go to Timers & More, then complete the "Rank C Challenge!" Request. At this rank, the Yo-kai Watch can unlock C-ranked Watch Locks and is able to find C-ranked Yo-kai.

This level is the lowest level Evolved Yo-kai can be.

Rank B
C Rank is the mid-highest level for all Yo-kai. To upgrade the Yo-kai Watch to this rank, one has to go to Timers & More, then complete the "Rank B Challenge!" Request. At this rank, the Yo-kai Watch can unlock B-ranked Watch Locks and is able to find B-ranked Yo-kai.

Rank A
A Rank is the second-highest level for all Yo-kai. To upgrade the Yo-kai Watch, one has to go to Timers & More, then complete the "Rank A Challenge!" Request. At this rank, the Yo-kai Watch can unlock A-ranked Watch Locks and is able to find A-ranked Yo-kai.

Rank S
S Rank is the highest level for all Yo-kai.