Hagrid will become available as a friend in your Friendship Journal when you reach Magizoology Level 2 and complete the Fairy Tale Adventure. You can increase your Friendship with Hagrid as more Creature Adventures are introduced.
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Harry Potter: Hogwarts Mystery GUIDE