Pokémon X and Pokémon Y

Also, does anyone have a confirmation on what Froakie's types are and what Nature would be good on him? My other friend is curious.

 Spoiler

Starts off as Water and final evolution is Water/Dark. Greninja has decent attack, high special attack and extremely high speed. Based on how you'd want to use him, different Natures would work better, mixed attacker, special attacker, fast attacker. I went with a special attack increasing Nature, since his speed is already high and I don't feel like there are enough physical Water or Dark moves to warrant making him a mixed attacker.