Tinker Bell and the Great Fairy Rescue (2010)

Tinker bell must team up with a rival fairy in order to prevent the humans from discovering their existence in Pixie Hollow.
This animated movie shows how two rivals share in the end the same problems they must work together to make sure that no human ever is aware of the existence of fairies and tinkers because mankind would surely want to claim their powers for their own ambitions that would disrupt the balance of the world so it is their duty to prevent that from ever happening so they must put aside their differences and work together.