[Wheatley happens to spend a lot of his time outside. Johto is fascinating, as are these creatures they've been given, presumably to train. He doesn't bother training his very often. He does love Companion Bat though, and she's out of her Pokéball. Wheatley is carrying her, but that really shouldn't be surprising. He carries her around everywhere. He actually hasn't realized that she has a happiness evolution! ...What does this say about him...]

[But anyway, that's not the point! Today he's in the base, looking for the source of that singing. It's quite pretty; he's never really had an extreme interest in music, but he's bored and there really isn't much else for him to explore around Goldenrod.]

[...Not that he's incredibly eager to leave and travel on the routes...]

[So Wheatley's checking the rooms, trying to pinpoint the voice. His hearing is still... kind of terrible and he's not used to trying to pinpoint a location while relying on ears. It's rather horrible, really. But eventually he does find the source of the voice, and speaks to the white-haired woman who is presumably singing (unless it's the rat, which he highly doubts).]

That's a rather nice song. You have a lovely voice! I haven't heard you singing down here before. What are you doing--?

[Wait a minute. He recognizes that Aerial Faith Plate! He'd recognize one of those anywhere! Wheatley's relaxed expression quickly shifts to irritation - he's been duped, hasn't he?]

Oh. It's you. Never mind, ignore what I said; I was obviously mistaken.