Is it possible to regain a "one time" spirit?

Let's say you get a spirit from completing one of the challenges and you end up dismissing the spirit. Didn't happen to me, but I was just wondering, would the spirit be forever lost? Or does unlocking the spirit just add it to the regular rotation of spirits on the spirit board and shops?


Solution 1:

All spirits can re-appear through New Game+ AND the Spirit Board, so don't fret if you've recycled one to make way for others.