LogFAQs > #979918020

Also I couldn't help looking it up, but I found out how the pins with question marks on their evolution work. Apparently they only evolve if the right person is wearing them.

Previously I had those pins and when I mastered them, they wouldn't evolve like the rest of the pins. So I put them aside. Then I had one of those question marked pins equipped on Fret and got more exp than I expected, and at the end of the battle screen the pin turned rainbow colored and asked if I wanted to mutate the pin, instead of evolve the pin. I said yes and voila, got a whole new stronger pin. Looked up that specific pin and apparently it evolves when Fret equips it, so I assume that's how it works for other pins and other characters, but I'm not gonna look it up yet in case even more people join my party and don't want spoilers.