The boss of Castle MacFrights is King MacFrights, a ghostly knight on horseback. This battle takes place in a jousting arena. You'll need to use the jousting poles to your advantage. When King MacFrights charges, dodge his attack, then use your Suction Shot on a jousting pole to swing it and knock him off his horse. Once he's dismounted, stun him with your Strobulb and vacuum him up. Repeat this process until he's defeated.
