The 1000 battle was very repetitive.
Is that all you have to say to that? XD
The thing I hated most about the 1000 Heartless battle (other than having the same number regardless of difficulty.) was that it wasn't so much a fight as much as it was mashing the △ button.
RISING SUN!! SNAG!! SPARKLE RAY!!!
Kills everything without any kind of difficulty or cost.