Arc 5 Chapter 2: The Road to the South
Think of it like a pseudo-mega evolution they don't need a stone to achieve; it makes them super strong and incredibly tough - too tough even for us." "with no other choice, we had to run, and i used a little trick i've picked up on my travels."
Chaos Chapter 12: Kidnapped
He knew volcan's strength - even powered up by mega evolution, he did not have the striking power to break this piece of wood with a single punch.