actually, there are two. the first is normal xemnas like in regular kh2. the 2nd is terra, an enigmatic soldier that, strangly, can wield the keyblade too, only its more macho and MUCH bigger. beating him gives you limit form, in which you can pull off moves from kh1 like ragnaroc and ars arcana.
you can't fight Xemnas in Kingdom Hearts 1. you can only fight him in Kingdom Hearts Final Mix. He's a special boss at the end of the game...
The Organization 13, precisely the last boss is Xemnas. If you have Final Mix, you can fight every member, as in the normal version, you can only fight a few.
The final boss that you play against is Ansem.
Beat the final boss.
the first boss of kingdom hearts 4 is the baby but you can't fight him until you find the giant lolipop_kingdom hearts 4 game designer
i think its data roxas
Im afraid that that's only on Kingdom Hearts 2 final mix.
you go to party in the pause menu but you can not change your party during a boss fight. this goes for all the kingdom hearts.
I own Kingdom Hearts 2: FinalMix+ and you can fight Terra. He is an optional boss and he is unlocked only after you have beaten every other world. After you have beaten the other worlds, return to the Disney Castle and go to the Throne Room (The huuuge hallway) and enter the small room at the other end of it. Here there should be a new crack in the wall where you will have the option to fight Terra (where it will teleport you to a new area for the boss battle). Happy playing ^.^
No, you cannot. There is a point in the beginning of Kingdom Hearts II, however, when you fight a boss with dual keyblades. You play as Roxas in The Mansion's basement, and you fight Axel, an Organization XIII member. You can also fight with dual keyblades when in Wisdom, Valor, Master, or Final Form as Sora (also in Kingdom Hearts II).
Xehanort, aka Xemnas, dies in kingdom hearts 2 when the player, teamed up with riku, defeats him in the final boss of the game.
Terra is unlocked as a secret boss after defeating the final boss fight, Xemnas, and saving your game since you're now able to save after the battle. Terra appears at Disney Castle's Hall of the Cornerstone.