Causes Feebas to evolve into Milotic when traded while holding it. This consumes the Prism Scale.
This item was introduced in Generation V due to the lack of a means to increase Beauty in these games. However, even in games in which the Prism Scale exists, a Feebas can still evolve if leveled up while its Beauty is high enough.
A Prism Scale appears during Chapter 4 of Detective Pikachu, being worn by Milo Green on his headband. He mentions that he obtained the scale when he was once saved from drowning by a Pokémon, which is later revealed to have been a Milotic. The presence of this Prism Scale also acts as the trigger to the Evolution of a Feebas that Milo has befriended.
A Prism Scale appeared in The Cuteness Quotient!, where it was attached to Jinny's Feebas. During an attack by Team Rocket, the Prism Scale fell off, but Jinny reattached it to Feebas, causing it to evolve into Milotic.
