HERE YA GO IM GOING TO PUT IT SIMPLY. THE MEGA STONE ACTIVATED ON IT'S OWN, MUCH LIKE HOW IT DID FOR ZERA WHEN HE NATURALLY MEGA EVOLVED, BUT, AND THIS IS A LITTLE OFF TOPIS ZERA DEVOLVES BEFORE EVERY FIGHT. WHICH MAKES LUCAS USE HIS MEGA STONE ON ZERA THAT'S THE ONLY POKEMON HE USES IT ON. Now what happened with Carl won't last long but it did happen, and I never once said Jean activated the mega stone I just said he had one with him.