As trainers who are in Kalos, Kieran and Joelle, of course, possess a mega stone that allows their Pokemon to go to another level (AKA Mega Evolution).
Being someone who loves accessories, Joelle chose to put it in a hair clip to show that she is not only a pretty face. She was thrilled because back in Hoenn, she only saw them in TV and never got the chance to get a Mega Stone.
As for Kieran it was a tad more tricky with his blindness, because he can't just search for his stone in his bag, or put it on like a jewelry with the risk of losing it easily with thieves or carelessness. So the professor decided to make his walking cane the bearer of his Mega Stone, with a secret place at the top, to which Kieran can accesss with a button.
I love my lil Joelle squishmallow! I wasn’t a big fan of the Bigfoots but this one came in a Costco 8-pack and I fell in love with her and her wiggly feets! Definitely one of my favourites now.