Alolan Raichu, Morelull, Pyukumuku and Wishiwashi have been leaked for Pokémon Sun and Pokémon Moon.
Images have surfaced on message boards that are believed to have been taken from a new trailer that will be released on Friday, as The Pokémon Company has previously promised.
These reveal that Yowashi will be localised as Wishiwashi, will have the ability Schooling, and turns into its School form once it reaches a certain level. While Water-type Namakobushi, as it will be known in Japan, will be called Pyukumuku and has the ability Innards Out.
New Pokémon that have been shown are Morelull, which is a Grass and Fairy-type with abilities Illuminate and Effect Spore, and Alolan Raichu, which will be Electric and Psychic-type with the new ability Surge Surfer.
Update: Team Skull boss Guzma and admin Plumeria have also leaked.
Pokémon Sun and Pokémon Moon will release exclusively for Nintendo 3DS in North America, Australia and New Zealand on November 18th, and in Europe on November 23rd.