Of course, when a pope is recognized as a saint in heaven because of miracles confirming his intercession, we Catholics acknowledge him on the occasion of his memorial and, because he dwells in the Presence of the Lord with the angels and the other saints (known and unknown), request his continuing intercession.
Pope Saint John Paul II: pray for us.
Pope Saint Leo I: pray for us.
Pope Saint Gregory I: pray for us.
Pope Saint Nicholas I: pray for us.