Didin't you make this thread week ago? I swear you or someone with a drake avatar did.
BAsically use librascope at the start, kill each seperate head by seeing its weakness, then go for the main head
When he charges for destrudo keep attacking him & eventually he'll make a noise indicating he has suffered a big blow, this will cut destrudo's attack power in half, basically making sure your party doesn't die from the attack
If its the chapter 11 one, grind.
All hail the KING, Andrespetmonkey