CoroCoro leaked recently and revealed new Ultra Beasts, as well as the secret
behind Rockruff's evolution. This was followed up by an official announcement of the new Ultra Beasts:
They are UB-02 Absorption which is exclusive to Pokemon Sun, and UB-02 Beauty which is exclusive to Pokemon Moon. In the video we see the Ultra Beasts in a battle with Hala and his Tapu Koko.