Here are the move sets of your opponents: Fennekin: Glow Punch, Ember, Tackle Crobat: Cross Poison, Air Slash Chandelure: Shadow Ball. Fire Blast Dragonite: Dragon Pulse, Dragon Claw Mega evolution is a new idea in X and Y; where some pokemon become stronger with the use of a stone/button. Mewtwo is one of those pokemon.
For those who don't want to travel across the country to play it. Note: Based off the actual demo; all music and sprites are owned by nintendo.