My friend has the Action Replay Max for the ps2 and she used cheats in every single game. I'm borrowing it right now so here's a cheats site that I found. It's only for Action Replay.
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http://www.gamespot.com/ps2/rpg/kingdomhearts2/hints.html
There are no in-game cheats for Kingdom Hearts II.
There are no cheats for Kingdom Hearts 2.
There are no working cheats for the Kingdom Hearts series.
There are no console cheats for Kingdom Hearts 2.
Kingdom Hearts is a PS2 game KH3? We dont know
You can't, there are no cheats for anything in Kingdom Hearts 1 and 2
There are no cheats
Release Order:Kingdom Hearts (PS2)Kingdom Hearts: Chain of Memories (GBA)Kingdom Hearts II (PS2)Kingdom Hearts: Coded (Cell Phone)Kingdom Hearts RE: Chain of MemoriesKingdom Hearts: 358/2 Days (DS)Kingdom Hearts: Birth by Sleep (PSP)Kingdom Hearts Re:coded (DS)Kingdom Hearts 3D (Nintendo 3DS) [unreleased]Chronological Order:Kingdom Hearts: Birth by Sleep (PSP)Kingdom Hearts (PS2)Kingdom Hearts: 358/2 Days (DS)Kingdom Hearts: (RE:) Chain of Memories (GBA/PS2)Kingdom Hearts II (PS2)Kingdom Hearts: Coded/Re:coded (Cell Phone/DS)I've listed all of the current Kingdom Hearts games that have been released. Other games that have not been officially confirmed such as 'Kingdom Hearts 3' are not listed.
http://www.cheatsguru.com/ps2/kingdom_hearts_2/hints/ go to this website and it gives you the answer to your question and cheats.
kingdom hearts 1, chain of memories, and 2 are all on the ps2
kingdom hearts defiantly