One way to get experience for your ally in Nazjatar or it can also be Prismatic Manapearls or some other cool stuff is to buy the daily item from the Murloc Mrrl.
To get access to his vendor you must complete the quest A safer Place. This quest is to escort him to your base. You find the quest at 48.43.
Once you have access to his daily wares. Get the Weakaura Mrrl´s trading game here https://wago.io/6YhvXz76q