I'm not a fan of X's mega evolutions. The X charzard is a physical attacker. Y Charzard is a special attacker and gets the drought ability. Auto sunny day combined with solar beam, also raises fire type move's power. Also X's Mewtwo turn fighting/psychic with a high physical attack. Mewtwo is a much better special attacker.
I dream of a better tomorrow, where chickens can cross the road and not be questioned about their motives.
lol well as for looks i say since i have not seen all mega evolutions yet i would choose charizard x for best looks and most powerful in my opinion is mewtwo y if u gear him with the right moves he dominates battles and also i NEED a shiny hidden ability greninja lol i try to add tons of ppl to my 3ds friend list so i may find one with water on friend safari so feel free to add my code its on my profile