Bosses in Kingdom Hearts

Answer 1

Dream Awakening-
A. Darkside Heartless I

Destiny Islands-
A. Wakka
B. Selphie
C. Tidus
D. Riku
E. Tidus, Wakka, Selphie
F. Darkside Heartless II

Traverse Town-
A. Leon (Squall)
B. Guard Armor
Wonderland-
A. Army of Cards
B. Trickmaster

Olympus Coliseum-
A. Preliminaries
B. Cloud
C. Cerberus

Deep Jungle-
A. Jaguar Encounters
B. Clayton and Stealth Sneak

Traverse Town-
B. Opposite Armor

Olympus Coliseum - Phil Cup-
A. Phil Cup

Agrabah-
A. Pot Centipede
B. Cave of Wonders' Tiger Head
C. Jafar
D. Jafar in Genie Form

Monstro-
A. Parasite Cage I
B. Parasite Cage II

Olympus Coliseum - Pegasus Cup-
A. Pegasus Cup
B. Leon and Yuffie

Atlantica-
A. Shark Encounters
B. Ursula with her Electric Eels
C. Gigantic Ursula

Halloween Town-
A. Lock, Shock, Barrel
B. Oogie Boogie
Giant Oogie Boogie

Neverland-
A. Anti-Sora
B. Captain Hook

Olympus Coliseum - Hercules Cup-
A. Hercules Cup
B. Hercules

Hollow Bastion-
A. Riku
B. Maleficent
C. Dragon Maleficent
D. Riku II

Hallow Bastion Revisited-
A. Behemoth

Olympus Coliseum - Hades Cup-
A. Hades Cup
B. Rock Titan
C. Hades
D. Cloud and Leon
E. Cerberus
F. Behemoth
G. Yuffie

End of the World-
A. Chernabog
B. Ansem
C. Darkside Heartless III
D. Ansem II
E. World of Chaos
F. Artillery: Small and Large
G. Face
H. Main Core
I. Final Ansem

Optional Bosses-
A. Phantom
B. Kurt Zisa
C. Ice Titan
D. Sephiroth

I'm pretty sure of this.