For codes the best places to look are kodewerx.net and bsfree.org.
You have NO IDEA how thankful I am that you posted that. Not only is it often a pain to find codes, especially (J) ones, but kodewerx had some awesome tutorials, and I got to do something with ZX that I've been itching to do for a LONG, LONG TIME.
Now, Cracker, can you do me an ultra-humongous favor? Can you make a trainer for this code?
Rockman ZX (J)
221041D2 000000FA - Model OX added to inventory
This code, unlike all other form-modifier codes yet released in any other region, actually adds Model OX to the menu instead of doing a forced transformation. This eliminates a few game-crashing risks, and lets you add OX to your save file.
BTW, for any who desire, the U.S. version of the above code is:
221045D2 000000FA
And, for whatever reason, while the code works standalone in iDeaS, I have to place this:
94000130 000003fa
d2000000 00000000
before it to get it to work with NitroHax. It's my first AR code, so I'm not sure what the deal is. I thought those two lines were only relevant for codes placed in between them. Lack an actual AR to test, so I'm not sure if this is an issue with NitroHax or not.