How to obtain.
Interested in having a Greninja of your very own? Then you've come to the right place! Though Greninja itself cannot be found, its first form, Froakie, can. So here is a list of all possible ways in which to get this Pokémon. Because Greninja did not appear in any Pokémon games prior to Pokémon X/Y this list will only cover locations from generation VI to present.
X/Y: One of the three starter Pokémon received from Tierno in Aquacorde Town. Can also be received in a trade from Shauna after becoming the Champion if you chose Chespin as your starter.