Felix relaxes as she starts babbling, and then flushes faintly at the praise. He's about to interrupt her when she interrupts herself instead and starts laughing. He's really not sure what he's supposed to do, here, so he just kind of...stares at her until she's finished, half-considering whether he should just...go...

But then she's asking him to keep going, and his faint flush returns.

"I don't...that's the only song I know. So far. I didn't write the arrangement, Greg did."

Which implies that either he or his Pokemon sang the song for Greg...but he'll just gloss over that.

"Um...I could play it again, though, and you could sing. If you want."