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

In India, adultery is a criminal offense under Section 497 of the Indian Penal Code (IPC). However, please note that in 2018, the Supreme Court of India declared Section 497 of the IPC as unconstitutional and struck it down. The court held that adultery cannot be considered a criminal offense as it is a private matter between consenting adults.

Therefore, your friend cannot legally punish the third person for adultery in India. Adultery is no longer a criminal offense under Indian law. However, your friend may consider other legal options such as seeking a divorce on grounds of adultery or taking civil action against the third person for damages, if applicable. It is advisable for your friend to seek the advice of a competent lawyer who can guide him through the legal options available in this situation.