Well the Bulbasaur line is the most "tropical" of them all considering the giant flower on his back. Blastoise is an amazing design... but he is pretty boring to use in the actual game. He's pretty slow, and while he can tank, other Pokemon do a better job on that front. Since there are so many water Pokemon, you really need something to stand out. Even his mega was by far the least useful mega of the Kanto starters.
The hard part about the leak is that I doubt non-Kanto Pokemon will get Alolan forms. But we don't know what the faded/nonfaded list means, it's all just assumptions at this point. If those are all the Pokemon in the game, some rough counting shows that there will be about ~350 in the Alola Dex, a bit down from the 457 (thank you Bulbapedia) in the Kalos Dex. One of my favorite things about the Kalos region was the abundance of different Pokemon from all generations, so I am hoping we get something similar in Alola as well.
