The basics.

Name: Greninja (English), Gekkouga (Japanese)
Type: Water/Dark
Species: Ninja Pokémon
Pokédex: #658 (National), #009 (Central Kalos)
Height: 4'11" / 1.5m
Weight: 88.2 lbs. / 40.0 kg
Abilities: Torrent, Protean (Hidden)
Damage Taken: Weak against Fighting, Bug, Grass, Electric and Fairy; normal against Normal, Flying, Poison, Ground, Rock and Dragon; strong against Ghost, Steel, Fire, Water, Ice and Dark; immune to Psychic.

Greninja is a generation VI Pokémon which makes its debut in Pokémon X/Y for the Nintendo 3DS. It is a Water/Dark-type Pokémon and is the final form of Froakie. It will evolve from Frogadier upon reaching level 36. It is the only known Pokémon that can learn the moves Water Shuriken and Mat Block. Greninja can be both male and female, though they are more commonly male. There are no visible differences between genders.