This month's CoroCoro has been leaked as of moments ago, and brings us some information about Rockruff and the Ultra Beasts.
Rockruff evolves into
Lugarugan, a single Pokémon that has a different appearance depending on whether it evolved in the day or night. It was claimed that Rockruff shared a secret with the Alola starter Pokémon, meaning that it's possible they could have similar evolutions. We'll have to wait and see.
Two new Ultra Beasts were revealed, or more accurately, one Ultra Beast with two different appearances. UB-02 takes the form of "Beauty" in Moon and "Expansion" in Sun, seen fighting Tapu Koko in the bottom of the left image.
The anime adaptation of Sun & Moon will begin airing in November.Edit: Next month's issue promises to show "the true strengths of Type: Null"