Today, March 23, 2021, is the fifth National Puppy Day (and counting) for Rockruff – so we hope it’s an extra special one for the adorable Puppy Pokémon! Rockruff made its debut via the Alola region in Pokémon Sun and Moon, and it reappears in the more recent Pokémon Ultra Sun and Ultra Moon. The games describe it as a sociable Pokémon. But as it grows, its disposition gets wilder and if it begins to howl when the sun goes down, that is proof that it’s close to evolving. It’s said that it leaves its Trainer’s side to evolve and returns again when fully evolved.