My friend 's wife cheated her and he has evidence of adultery .he want to punish that third person legally

In India, adultery was considered a criminal offense under Section 497 of the Indian Penal Code (IPC) until 2018 when the Supreme Court of India struck down the provision as unconstitutional and decriminalized adultery. Therefore, there is no legal recourse available to punish the third person involved in the adultery.

However, under personal laws like the Hindu Marriage Act or the Special Marriage Act, adultery can still be grounds for divorce. Your friend may consider consulting a divorce lawyer to explore the possibility of filing for divorce on the grounds of adultery.

It is important to note that any legal action should be taken after careful consideration and consultation with a qualified lawyer to understand all the legal implications and options available in this situation.