Board Thread:Questions and Answers/@comment-31155663-20170810161651/@comment-4435241-20170810184557

Rococo is not mentioned in the whole GO series. So not in GO, Chrono Stone or Galaxy. He appeared in Episode 030 (Chrono Stone) though when Kino Aki was talking about the past (when Inazuma Japan and Little Gigant played against each other) but he isn't specifically mentioned.