You can finish the cups easiliy with the required points, if you summon "Stitch". Unequip Sora's abilities except "Combo minus" and equip him with the "Fenrir" so every hit is a finishing move and you can easily beat phil's training mode with over 1000 points.
That's right but I've never said you can't avoid it.;)
Normally I'm writing my strategies in german. So it's a bit unaccustomed for me to write them in english so I don't write my complete strategies here at the moment.
Use Donald's "Comet" and aerial abilities. You have to wait for the reaction command to use "jump". Use this command and attack him quickly before he is able to use his "wind"-spell to protect himself again. If he jumps into the air you can't reach him and his spears will drop from above. Begin to move and don't stop until Xaldin is reachable again. Xaldin begins a series of deadly combo attacks. There isn't much you can do to avoid this, aside from the "Jump" command, or Donald's "Comet". If they're not available, use the "Guard" command. You can Keep your distance if you see a green aura around Xaldin. If Xaldin is transforming his spears into a "dragon" you can run to the other side of the bridge to degrade the damage you'll take. It's possible that King Mickey appears if you don't give up so you'll have a new chance.
Cerberus is very easy. You have to hit him till he is ready to jump and using his shockwave. It's better to avoid it, you know. Use aerial abilities to attack him easier and if you are able to use your reaction command press the "triangle"-button to use the "Evade/Jump!/Dog Paddle" and then there is no problem to defeat Cerberus. But the battle against him is very easy and you can beat him before the command appears.
I am Cetra and I've found this site because I am a great fan of Kingdom Hearts (you can call me freak, too XD). This forum looks very interesting and I hope you can understand me, because I am from Germany. So I'm sorry if something what I have written or I'll write is wrong. But I'll try do to my best.^^
I am very interested in Final Fantasy and Kingdom Hearts an I know Final Fantasy for ten years and I'm playing it every day so I can answer your questions about the games (I have to answer a lot of questions every day and it would be great to answer yours, too:)).