The suggestion is simple, a candy literally with the effect opposite of the rare candy, that consumable will remove -1 level from the pokemon that eats it. I have seen cases where the player evolves the poke in another region but because of the level differences in each region, you can no longer use it to continue the story mode because the level has just passed the limit available at that time forcing the player to evolve a pokemon all over again. Or simply maybe trainers want to leave th