Just use the heartless, it spits out to replenish your HP.
Use Air combos only, regular combos tend to get you knocked off his head and makes it easier for you to get shot by his lasers, which you can also guard to knock back.
Surprisingly Easy boss fight. Thunder does good damage to every part of his body, so use it up and attack to get your MP back. Stay aggressive and guard/evade when you have to. If you do it right he shouldn't even be able to shoot off his cannon beam.
I think I may have glitched this boss because I had Sneaky Stealth pretty much knocked out the entire battle. As long as you keep both Sneaky Stealth and Clayton separated you can't be overwhelmed. The Chameleon's beam attack is easily avoided by dodge rolling into him just as he fires off the beams. Keep the pressure on at close range with air combos and he'll go down easy and as long as you're close to Clayton he can't hurt you.
Pretty easy boss to deal with. Thunder helps A LOT during this boss fight so use it all up and use your combo to gain it all back. You can lay in a couple of combos while he's walking around spitting fireballs since they shoot outwards and not directly to your location. Dodge rolling the pits while staying close to Cerberus' backside is the safest way to avoid taking a damage from his dark vomit attack.
Honestly I should've died here because this fight was nearly impossible for me to do without guard. Sora attacks so slow you have to know exactly when Cloud's going to do his regular 3 swipe combo. If you don't have guard you have to pretty much just stick and move; if you're lucky he won't use Omnislash.
This has got to be the shittest boss to go up against near the beginning. Compared to his KH counterpart he tends to deflect your attacks by putting his knees up at the last second which makes him a lot more difficult to knock out. To make matters worse he sets his batons on fire which do 2x's as much damage. You can dodge roll out of the way but his reach is a tad bit longer so time your rolls right. The Fireball isn't really a probably to dodge if you're close enough to him.