I also admit that mega evolutions are just a way to draw in new people and many of the mega evolutions are just stupid. Blastoise mega evolution adds a third cannon to it. But, this is some concept art I found while looking for mega evolutions. These mega evolutions would be great to actually have.
[img]http://1.media.dorkly.cvcdn.com/53/24/724018b8fc1be7d1f615b18a9ffa6b24-johto-mega-evolution-concept-art.jpg[/img]