You were held captive and nothing but a slave to Team Flare, Lysander's helper detected Mega evolution power within you, in fact, they even theorize that you can mega evolve. Knowing that it was impossible, you never believe a word from them. But what if they were right? What if they use your special ability to harm the world? You made up your mind to run, and you succeeded with the help of Zygarde, the Order Pokemon. Trying to survive on your own, you stumble upon Ash and his friends, and they took care of you. That really made you wonder, why are these humans so nice to you? That is the start where you realized that not all humans are bad.