Tonku

Well, I think mega evolution works like this: you have a pokemon hold their mega evolution stone, and at the start of the battle they will evolve into it... I think. Water types are also my favorite starter, I've always chosen them (except for DP, I chose fire), and I agree the fire and grass look cool too. Have you seen all of their second forms yet? They revealed what their first evolutions look like today.

Ahh Ive seen the fake forms people have been drawing, but I don't think ive seen any of their evolutions. Gotta link? D:

As for starter choice yeah the waters were always the coolest ones. (i always liked every second evolution best though) and the only time ive chosen another starter besides water would be Red and that was Charmander ahah. From the newer games its been water though mostly. Also ahh that would make sense then if they held something to mega-evolution hummm.

http://cdn.bulbagarden.net/upload/7/71/Haribōgu.png

http://cdn.bulbagarden.net/upload/2/21/Tērunā.png

http://cdn.bulbagarden.net/upload/5/5d/Gekogashira.png