Greninja (ゲッコウガ, Gekkōga, /ɡrɛˈnɪndʒə/ greh-NIN-jə) is a Pokémon species in Nintendo and Game Freak's Pokémon franchise, introduced in Pokémon X and Pokémon Y, that has since appeared across a wide variety of Pokémon media. It is the final evolution of Froakie, the Water-type starter Pokémon of X and Y, with either the ability 'Torrent' or 'Protean', with 'Battle Bond' as an event ability, enabling it to become Ash-Greninja, and the immediate evolution of Frogadier. Ash-Greninja has increased speed. Categorized as the "Ninja Pokémon", Greninja is a Water- and Dark-type Pokémon who is a frog-like master of swiftness and stealth. It appeared prominently in the XYZ series of the Pokémon anime as one of Ash Ketchum's primary Pokémon, voiced by Yūji Ueda. This Greninja used its bond with Ash to transform into a unique and powerful form, Ash-Greninja, which was later released to the games as an empowered form of Greninja accessible to players of the Pokémon Sun and Moon Special Demo Version. Greninja was introduced as a playable fighter to the Super Smash Bros. franchise with Super Smash Bros. for Nintendo 3DS and Wii U as one of the Pokémon series' five representatives, and was integrated into manga such as Pokémon Adventures. Also, Greninja was in Super Smash Bros. Ultimate for The Nintendo Switch. Greninja has been met with a very positive reception, quickly becoming one of the most popular Pokémon of the sixth generation, and of all time in the 2020 vote with 140559 votes, because of its endearing design and strength in competitive play. Its popularity has resulted in its integration into various merchandising and promotions of the Pokémon franchise. From Wikipedia