To defeat Cerberus, you might want to consider jumping on his back and attacking the heads when they rise, and leave head-on fighting to your allies. If you have aero, use it if you get stuck in front, and if Cerberus uses the move where black holes attack you from under, jump allthe way to his tail. Have extra MP? Use thunder on him!
Kingdom Hearts 1: Beat Cerberus in the hades cup Kingdom hearts 2: Complete the Pride Lands for the second time
You can't play Kingdom Hearts Final Mix after beating the regular Kingdom Hearts games. They are separated and needed to be bought if want to be played.
No, just beat Melifecent
After you beat the Parasite cage once.
If you are talking about Kingdom Hearts, then after that you go anywhere you haven't visited yet.
By defeating Jafar.
Thankfully, no.
Yes, after you beat the Neverland world, you can get it that way for Kingdom Hearts I. In Kingdom Hearts II you would have level up Final Form at level 4.
Go down to his mountain and go in.
Kingdom Hearts 1: Beat Cerberus in the hades cup Kingdom hearts 2: Complete the Pride Lands for the second time
You either go to the world that never was or beat sephiroroth.
Play Kingdom Hearts 2 and wait until Kingdom Hearts 3 comes out. Hope that helps! =D
By attacking her.
You have to find lots and lots of heartless.
Fight.
You have to beat Ansem
No