I've never done a time travel spell... Though I suppose that Starswirl the Bearded's research could-

[She shakes her head. Not the point!]

That is a very, very good question. I don't even know where to start coming up with an answer, though. Maybe-

[She's interrupted by a growl from Giratina, which she responds to by yelping and jumping back away from the towering beast.]

Okay, I think we might want to wait for a more optimal time to figure this out!