I have Sonic and The Black Knight for the wii. but i don't know how to defeat king arthur. How and when do i attack him? plz help

First of all, I'll let you know, after you beat him, it isn't the end of the game. ;) It's been a while since I've played it, but you run up to him, avoiding all attacks, and then swing the Wii remote when it tells you to. Hope it helps.

What I did was I used soul serge over and over. It worked