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A code that allow you to save to the memory card anywhere(not just in save spots)

For example this code allows you to save anywhere in Tales of the Abyss(usa)
2034C83C 1000002B

What method I need use to find that this address allows saving anywhere

Unfortunately for something like this, you're gonna have to get out a disassembler and start analyzing code. Since the concept of "allowing saves" is a part of the game and not a Sony SDK, it is going to be specific to every game, not a quick search for some SDK library.

Generally the game will probably be looking for some conditions to be met in order to allow advancing to the save menu; if you can find where this conditional branch occurs, you can replace it with an unconditional jump instead.