@Kentucky Fried Torchic

Brock smiled when he heard a familiar tin whistle playing a spirited jig, which echoed through the enclave. "Seems Ash is here..."

Sure enough, Ash--in a costume that evokes a red mage from Final Fantasy--arrives in the room, playing a shiny gold whistle with a green mouthpiece.

(what Ash's costume looks like
what Ash's "magic whistle" looks like
what he is playing)