I accidentally used Harmonious Porcupette instead of the Spectral one. Didn't notice my mistake until mid-battle when I looked for Powerball. Oops!! So, he kept Tranquility up, used Moonfire on CD and Clawed the rest of the time. He died at the same time Little Blue died, leaving Broom to claim the victory. Anyone who doesn't have a Spectral Porcupette might want to try Harmonious.
I didn't have the Spectral Porcupette leveled, so I used Eye of Observation since it also has Powerball and that's the only move listed. The Servent of Demidos also worked better for me than the Pen... my Pen kept getting destroyed early.