Granbull was originally a Snubbull living in Pokémon Square. After the player and partner were thought to be the cause of the natural disasters, Snubbull was one of the Pokémon who chased them. Snubbull gave up early on though, citing Lapis Cave to be the best he could hope to reach.
Snubbull was later at Hill of the Ancients celebrating the victory of stopping the falling star from destroying the planet. Later, he evolved into Granbull after walking into Luminous Cave. At first, he was upset because his appearance had changed dramatically, however, after Alakazam explained to him that he had become more powerful, he was happier.