When his heart turns white, use normal attacks. When his heart turns red, use fire. blue, blizzard. yellow, thunder. When your allies have a timer on their head, cast stop on Big Ben the clocktower. How I beat him is that i Just stayed by Big Ben the whole time, cast stop, and heal. I also did magic when Donald was clueless. But don't waste. Sometimes, I let Phantom hit me to refill MP, and then I could do more magic spells.