How do you defeat chernobog at the end of Kingdom Hearts

Boss: Chernabog
Difficulty: Easy
HP: 1500
EXP: 15,000p
Rewards: Superglide (Shared ability)

You might remember the Chernabog from Fantasia. This is an easy
fight, mainly because you are flying. You can't use any special
attacks or summon spells, but you don't need them anyway. Cast
AEROGA (or AERORA if you didn't get all of the PUPPIES), and then
get right up in the Boss's face and start hacking away. Try to get
behind the head for the best results. Chernabog breathes fire,
and will also use a big gust of wind to blow you away from him. His
ultimate attack involves an enormous surge of flames, which can be
avoided at low altitudes, or by flying towards the screen. Use
CURAGA to heal yourself if necessary. If you keep dying when Chernabog flames up, consider this tip: whenever you see him crouch down and little flames appear around him, quickly fly away, leaving you unharmed.