Pokémon the Series: Sun & Moon Episode 15: Rocking Clawmark Hill!
Episode 15 of 146 of Pokémon the Series: Sun & Moon, aired February 23, 2017, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Ash and Professor Kukui find the wild Rockruff who lives with them limping home, covered in scratches and burns, completely exhausted. The next night, they follow it to Clawmark Hill, where two Lycanroc keep watch over the wild Pokémon who come together to battle and train.