Rainbow Dash isn't a patient Pegasus in Equestria. When Twilight brings a new friend from the Human World to Equestria, the mane six keeps asking friendly questions to the caped pony. The new friend with the cape refuses to reveal herself, even to Twilight for an unknown reason.
Rainbow finds out that she has wings when she hears Flash call her "Princess."
The next day, she challenges her, but she does not give a clear answer why not.

Crossover: MLP characters and my Pokemon OC.