While taking a hike through the mountains of Kalos during a severe thunderstorm, you could've sworn that you saw a dragon-like creature flying through sky every time lightning struck. Your belief was proven to be true as a creature flew out of the sky and revealed itself. It was the legendary Pokémon Rayquaza, and it was mega evolved. Once it was revealed, it let out an ear-piercing screeching roar, and thunder and lightning struck all around the mountains.