I have finally gotten to my 50th mega evolution! Thank you all for your comments, votes, and general support. Because this is my 50th, I am doing something special: I'm giving away a shiny Nidoking. If you want a chance to win this entirely free giveaway, comment your favorite mega evolution from this book and what you liked about it most below. In approximately one week, I will close the raffle down and no more comments will be suggested, so comment quickly for your chance to win!
Also because I've now done 50 Megas, I'm now doing short summaries of each mega evolution i do at the end, from this chapter on.

Mega Nidoking would get the (made up) ability groundbreaker, which removes hazards when the pokemon mega evolves or switches in. It would trade in its ground type to become a powerful poison-dragon dual type.
Its attack and defense stats would greatly rise, as well as its and speed. Its appearance changes to where the spikes are huge and more noticeable, and battle armor covers its body. Its arms, hands and claws are huge and its tail gets sharp poisonous spikes on it.

Description:
Mega Nidoking have such tremendous power they often cause earthquakes. They are equally powerful on the defense as well, as the extremely toxic spikes on its armor keeps opponents at bay.

Stat boosts:
50 attack
30 defense
20 speed