Can a false pope become a saint? Please answer step by step:
A false pope, or antipope, is someone that tries to claim they are the true pope but the church rejects them. Hippolytus (c. 170–235 AD) headed a schismatic group as a rival to the Bishop of Rome, thus becoming an antipope. Hippolytus (c. 170–235 AD) was named a saint in the Roman Catholic Church.
So, the final answer is yes.