The first time you battle against Zhu Bajie, you won't get any rewards other than Will. Also, you'll have the chance to battle against Zhu Bajie (Part 2).

To unlock this battle, you must first defeat Zhu Bajie (Part 1). The first time you'll battle against Zhu Bajie will be at the Webbed Hollow, near the Hut of Immortality Shrine. Then, Zhu Bajie ...

She adds: "You know, that's really fun. There's a lot of lovely characters in [Black Myth: Wukong], like Zhu Bajie, the little warthog guy. You're probably with him for the most part of the game.