i'm a having a hard time defeating demyx in garden of assemblance.. could you give me some tips on how can I defeat him? because its hard to kill all his water especially when the number becomes more than 50... please help me

make sure you both attack AND use the reaction command to kill alot of them and when it comes to him watch out for the pillars of water when hes attacking in the middle cos he can hit you into the water which hurts so just keep tryingand lvl up if need be but thjat wont help against the water forms.
hope i halped ya.

Thanks for the help... I finally got past the 75th water but when it comes to 99 waters, I'm having a hard time, I cant make it in time... Could you give me some tips again...

well when doing this i did have a turbo controller so i set turbo triangle and the just attacked.try and stay in a place where theres lots of them together and the fight there because you will take more out with wild dance.
if its still too hard just keep trying and you may get lucky.
good luck.