Chespin's third evo is interesting... But it doesn't look like a Pokemon to me *(And I know how hypocritical it is for me to say that). The color scheme, the way the shell resembles armor, and the proportions make it look like one of those sapient non-human races in a PS1/PS2 era RPG, and it's kinda creepy. 0_o I actually find it more distracting than Delphox.
Still, I like the inventive shell on the back and I like having another Grass/Fighting type. I don't feel it's boring like Delphox, so kudos to Gamefreak for that.
Greninja is definitely my favorite, though. It has a dynamic pose, a great visual evolution of the bubble scarf with a tongue scarf, and it's a ninja. Go #teamfroakie
EDIT: Can't believe people think a ninja frog with a tongue scarf is shit. That concept on its own is weird enough and cool enough to be on my team.