ALERT: There will be spoilers on Pokémemes before the release.
Greninja is Water/Dark.
Delphox is Fire/Psychic.
Chesnaught is Grass/Fighting.
Well, we imagined it for you. The word Pokémon is short for "pocket monster," and kaiju is Japanese for "strange creature" and is used to describe giant monsters, famous in Japanese cinema. (Also, what else were we supposed to do while waiting for the release of Alpha Sapphire and Omega Ruby?)