Help with Kingdom Hearts 2!?

Question

In KH2 in Hercules world, you do that thing where you fight without Donald and Goofy and I find it impossible to get past! How on earth do you do it?

Answer 1

As soon as the battle begins, jump back to avoid the initial jump and resulting shockwave. It will jump like this fairly often during the battle, and it will actually be somewhat difficult to avoid the jump if Cerberus decides to jump ON you. The shockwave can usually be jumped over though.  

Also, Cerberus will spin around fast, swiping you with its tail. This particular attack is hard to predict, but you won't see it that often. Basically, the idea is to target any one of the heads and hack it madly. You really aren't in as much danger of getting bitten as you were when you fought it in Kingdom Hearts I. Just keep hacking away, healing when necessary, until Cerberus starts using new attacks.

After a while, it will jump away from you and start coughing up dark balls of energy that come slowly raining down onto you. They are pretty easy to run away from.                

It will also start using an attack where it slams its two outer heads together in the middle. Even though it looks painful, you'll want to jump right into this attack to trigger helpful reaction commands. Sora will get pinched in between and hoisted up into the air. When the middle head goes to bite you, use Evade to put the keyblade in its mouth. Soon after, use Jump, and after that use Dog Paddle while in the air to knock it out. It will actually be stunned for a good amount of time, so just use as many combos as you can on it.  

A good time to use Auron's limit is when the beast is about to die (or whatever you call dying when you're in the Underworld already). Otherwise, conserve MP for healing.