What form(s) do I need to file if ex falsified asset information for chapter 7 during divorce in California?

I am not sure what you want to do. Get her prosecuted for bankruptcy court fraud. Change the terms of your divorce.

You need to clarify for what purpose you need to show that he falsified information. Why do you want to show he falsified asset information. You can go to the 341(a) hearing and bring it up or you might want to inform the Trustee so that the Trustee can investigate. Further, there are just too many details missing, when was it filed? Is it already discharged, etc.