Kingdom Hearts II cheats and cheat codes for Playstation 2

Unlock Keychains:
How to Unlock - Unlockable
Finish the fight with Axel in Twilight Town - Bond of Flames
Speak to Simba after arriving at The Pride Lands - Circle of Life
Beat Sephiroth, the optional boss at Hollow Bastion - Fenrir
Beat Barbossa at Port Royal - Follow the Wind
Beat Hades in the 'Underworld' section of Olympus Coliseum - Guardian Soul
Speak to Yuna after completing the above - Gullwing
Beat the Hydra at Olympus Coliseum - Heros Crest
Beat Shan-Yu in The Land of Dragons - Hidden Dragon
Beat the Test Subject in Halloween Town - Holy Pumpkin
Beat Pete at Timeless River - Monochrome
Finish Sora's first visit to Twilight Town - Oathkeeper
Beat Xigbar in The World that Never Was - Oblivion
Finish Space Paranoids - Photon Debugger
Speak to Beast after returning to Beast's Castle - Rumbling Rose
Go to Ansem's study in Hollow Bastion - Sleeping Lion
Obtain Valor Form at The Mysterious Tower - Star Seeker
Finish the 'Spooky Cave' Mini-Game in The Hundred-Acre Wood - Sweet Memory
Obtain the Ultima Recipe in the basement of the mansion in Twilight Town 
After that, you may use the Moogle Shops to synthesize the keychain - Ultima Weapon
Beat Jafar in Agrabah - Wisher's Lamp
Finish Chapter 4 of Atlantica - Wonders of the Abyss

In-game reset:
Hold L1 + R1 + L2 + R2 and press Start + Select while playing the game

Easy finalform level up:
First,go to theworld that never was.
Then,go to Twilight's View,and turn to finalform.
Next,go to the next room,and destory the snipers.
Then,go to the next room,and detosry the nobodys.
Contiue this to the point where the room where everybody is at.You should get about 75exp.(if your guage is going low,go staigt to the room where everyone is at,and your guage will be full!!)