A Vileplume...? Oh! [the volume of her voice lowers, as she turns her head away from the journal towards the pokemon] So that's what you've been saying this whole time? Your name?

Vile, vile!

[back to the journal] Ah, I see now...

So, if I'm getting this right... the castle took everyone to where this vileplume came from in the past? And someone brought it back with them...?