Who is this mysterious person in this mask...?!

No-one knows who she really is, but she goes by the pseudonym of Dark Angel and is the most powerful warrior of a great evil that seized control over the world in the future.
An evil Shiny Celebi named Legit infused the charm in the chest of the Dark Angel's suit with temporal magic, allowing Dark Angel to time travel.

Dark Angel came to the past to crush the resistance before it was even formed to ensure the reign of the great evil.

But nothing is quite as it seems...