The Japanese magazine has teased that it will share Rockruff’s Secret Evolution on a poster that will come with next month’s issue. As to what that secret will be is anyone’s guess.
Rockruff is a Rock-type Puppy Pokémon, that we know “gets wilder” as it grows. If it howls when the sun goes down, it is an indication that the is close to evolving. When that happens, it leaves its Trainer’s side to evolve and then returns when it has fully evolved.
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.[Thanks Serebii]