Tenant with fraud identity sublet and subtenant has filed answer to UD playing victim

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Hello Community, looking for advise and examples of anyone been in similar situation. A tenant used fraud identity (trusted Zillow reports, which was a huge mistake) to sign the lease. Property is in Sacramento, California. Tenant stopped responding and I found out soon that home has been sublet after serving notice to pay rent. Subtenant didn't cooperate to meet or communicate further to resolve the situation. As this was getting complex, we continued with eviction steps and served Unlawful Detainer (UD) summons. Subtenant has answered UD with court with false claims, playing victim and claiming paying huge amount to the original tenant who scammed subtenant. Court has set trial. It's evident that this is a group operating to scam landlords. Please help me with legal angles, defense, documents and needed proofs I should gather for the trial. Thank you.