So you're at the wasteland, right? We just installed this machine there and the signal's a little wonky. Oh well. Aya's new as a leader, as you know. Unfortunately, that means I don't know a whole lot about her. What I can tell you is that I know she favors Double battles, and she fights using the Wasteland itself. You might have noticed when getting there but that area can be a little unpredictable. Wasteland attacks can inflict random statuses or have other effects. So be careful, or else you'll get wasted. Sorry, couldn't resist.
Anyway, the gunk that coats Byxbysion is kind of squishy and jello-like. Because of that, it eats up some Ground type attacks, which helps her a lot. Try focusing down one target at a time with an emphasis on her Pokemon's secondary types. If you play your match-ups well you can definitely win.
[Lana]: Um, excuse me, was this machine installed for the sole purpose of telling people how to beat my daughter? How is that fair? Turn that thing off at one! Now!