cheat Kingdom Hearts 2

Kingdom Hearts II Unlockables
Summons

Where to get each summon:
Unlockable How to Unlock
Peter Pan In the ship graveyard in the second visit to Port Royal.
Stitch In the hallway to the computer room in Hollow Bastion, after you get Master Form.
Genie Defeat Volcano Lord and Blizzard Lord
Chicken Little In the 100 Acre Wood, after the world's second cutscene.
Torn Pages

Torn Pages are required to play and complete all of 100 Acre Woods.
Unlockable How to Unlock
Torn Page 1 In the Disney Castle's Library.
Torn Page 2 In the Pride Lands at the Oasis
Torn Page 3 In Hallow Bastion at the Crystal Fissure
Torn Page 4 At the Land of the Dragons in the Throne Room
Torn Page 5 At Agrabah at the Tower
Cup Unlockables

The Paradox Cups can be played by talking to Hades in Hade's Chamber.
Unlockable How to Unlock
Pain and Panic Cup Clear Disney Castle for the first time
Cerberus Cup Clear Agrabah, Halloween, and Pride Land for the first time
Titan Cup Clear Olympus Coliseum for the second time
Goddess of Fate Cup Clear previous cups and beat the first fight with Xemnas
Paradox Cups: Pain and Panic Clear all the previous cups
Paradox Cups: Cerberus Cup Except Final Form, Form levels must be at Lv. 5 and must unlock Paradox Cup: Pain and Panic
Paradox Cups: Titan Cup Summon level should be at Lv. 5 and have the Paradox: Cup Pain and Panic unlock
Paradox Cups: Hades Cup Clear all the previous cups, clear Space Paranoids for the second time, and have ALL forms and summons at Lv. 7
Special Models

These are special models of gummi ships you can get by doing the certain gummi missions and getting S ranked on them.
Unlockable How to Unlock
Mushroom Model S-Rank: Assault of the Dreadnought Mission 1
Highwind Model S-Rank: Asteroid Sweep Mission 2
PuPu S-Rank: Stardust Sweep Mission 2
Tonberry S-Rank: Phantom Storm Mission 2
Moogle S-Rank: Splash Island Mission 2
Mandragora S-Rank: Floating Island Mission 2
Chocobo S-Rank: Ancient Highway Mission 2
Cactuar S-Rank: Broken Highway Mission 2
Cait Sith S-Rank: Sunlight Storm Mission 2
Fenrir S-Rank: Assault of the Dreadnought Mission 2
Kingdom Model S-Rank: Asteroid Sweep Mission 2
Secret Model S-Rank: Assault of the Dreadnought Mission 3
Kingdom Hearts II Glitches

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Instant Max Drive

If you want you drive bar maxed, all you have to do, is, Go to the Underworld tournament. Talk to Panic, after talking to him, A screen of all Tournaments pop up.

Go to any one, and once you enter the first battle, Your Drive Bar will be completely filled. Pause, and select quit. When you leave, your bar is still full.

This will help you level up forms and summons quicker.

Also, if you return to the world map while in a drive form you will have a full drive gauge.
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Quick Summon/Form Levelling

In Space Paranoids, just use any form or summon, and let the form/summon meter count down until it's almost gone. Then, immediately board the Solar Sailer. Your form/summon will be cancelled, but your drive gauge will be returned to its original state. Ride the Solar Sailer, then use the form/summon again. After the ride is over, head back and all of the enemies will return. Repeat until forms and summons are maxed. Obviously, this will not work for Final Form, since there aren't any Nobodies in Space Paranoids, but the other forms and the summons can be levelled freely, without any pesky drive-gauge refilling. It's possible that this trick works in other areas, too, but I have not explored it (the Black Pearl is an idea though).

Also, to level summons specifically, the experience counter seems to increment when the summon meter ticks down a notch. If your timing is good, try to kill enemies with drive orbs right when the meter is going to drop a level. If you can keep the meter almost full as you collect the orbs, you can make it oscillate between two numbers, netting extra experience for your summons. With this, you can get over 30 exp every time you use a summon.