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Rockruff evolves into a different form of Lycanroc depending on the version of the game. If it evolves in Pokémon Sun, it will become the Midday Form; whereas if it evolves in Pokémon Moon, it will become the Midnight Form.
The midday form of Lycanroc tend to live in mountains. they are solitary hunters and actually avoid making packs at all costs to prevent disputes. However to any trainer who accepted them while in their rambunctious Rockruff stage, they are fiercely loyal and will gladly die before disobey a trainer they have bonded with.
The midnight form of Lycanroc prefers to let its enemy get the first hit before delivering a devastating counterattack. They are predisposed to violence and easy to get excited by a worthy opponent, which is shown by their glowing eyes. They will not accept trainers that they feel are poor battlers or give questionable orders.
Midday form Lycanroc is based on wolves while Midnight form Lycanroc is based on werewolves.
Lycanroc is a combination of the words "Lycan" (from the Greek Lykos, meaning wolf) and Rock due to its typing. Lycan may also refer to the modern use of the word "Lycanthropy" (the technical term for the affliction of being a werewolf) due to how Rockruff evolves.