Creating a mega evolution every day until Pokemon legends z-a comes out – Day 21: Mega trevenant

The impact of mega evolution causes the growth of burls and the chipping of trevenant's bark, but it also attracts the bitter souls of fallen warriors from the kalos war, which thwart the will of trevenant itself. These evil spirits feed on the life energy of both the people and pokemon who are unfortunate enough to walk under its long, thin fingers.